/*
        TableSort revisited v3.3 by frequency-decoder.com

        Released under a creative commons Attribution-ShareAlike 2.5 license (http://creativecommons.org/licenses/by-sa/2.5/)

        Please credit frequency decoder in any derivative work - thanks

        You are free:

        * to copy, distribute, display, and perform the work
        * to make derivative works
        * to make commercial use of the work

        Under the following conditions:

                by Attribution.
                --------------
                You must attribute the work in the manner specified by the author or licensor.

                sa
                --
                Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license identical to this one.

        * For any reuse or distribution, you must make clear to others the license terms of this work.
        * Any of these conditions can be waived if you get permission from the copyright holder.
*/

var fdTableSort = {

        regExp_Currency:        /^[£$€¥¤]/,
        regExp_Number:          /^(\-)?[0-9]+(\.[0-9]*)?$/,
        pos:                    -1,
        uniqueHash:             1,
        thNode:                 null,
        tableId:                null,
        tableCache:             {},
        tmpCache:               {},

        /*@cc_on
        /*@if (@_win32)
        colspan:                "colSpan",
        rowspan:                "rowSpan",
        @else @*/
        colspan:                "colspan",
        rowspan:                "rowspan",
        /*@end
        @*/

        addEvent: function(obj, type, fn, tmp) {
                tmp || (tmp = true);
                if( obj.attachEvent ) {
                        obj["e"+type+fn] = fn;
                        obj[type+fn] = function(){obj["e"+type+fn]( window.event );};
                        obj.attachEvent( "on"+type, obj[type+fn] );
                } else {
                        obj.addEventListener( type, fn, true );
                };
        },
        
        removeEvent: function(obj, type, fn, tmp) {
                tmp || (tmp = true);
                if( obj.detachEvent ) {
                        obj.detachEvent( "on"+type, obj[type+fn] );
                        obj[type+fn] = null;
                } else {
                        obj.removeEventListener( type, fn, true );
                };
        },

        stopEvent: function(e) {
                e = e || window.event;

                if(e.stopPropagation) {
                        e.stopPropagation();
                        e.preventDefault();
                };
                /*@cc_on@*/
                /*@if(@_win32)
                e.cancelBubble = true;
                e.returnValue = false;
                /*@end@*/
                return false;
        },
        initEvt: function(e) {
                fdTableSort.init(false);
        },
        init: function(tableId) {
                if (!document.getElementsByTagName) return;

                var tables = document.getElementsByTagName("table");
                var workArr, sortable, headers, thtext, aclone, a, span, columnNum, noArrow, colCnt, cel, allRowArr, rowArr, sortableTable, celCount, colspan, rowspan, rowLength;
                var onLoadTables = [];
                
                a               = document.createElement("a");
                a.href          = "#";
                a.onkeypress    = fdTableSort.keyWrapper;

                span            = document.createElement("span");

                for(var k = 0, tbl; tbl = tables[k]; k++) {

                        if(tableId && tbl.id && tableId != tbl.id) continue;

                        // Remove any old dataObj for this table (tables created from an ajax callback require this)
                        if(tbl.id) fdTableSort.removeTableCache(tbl.id);
                        
                        // Remove any old tmpCache object for this table
                        if(tbl.id) fdTableSort.removeTmpCache(tbl.id);
                        
                        allRowArr = tbl.getElementsByTagName('thead').length ? tbl.getElementsByTagName('thead')[0].getElementsByTagName('tr') : tbl.getElementsByTagName('tr');
                        rowArr = [];
                        sortableTable = false;

                        // Grab only the tr's that contain no td's and check at least one th has the class "sortable"
                        for(var i = 0, tr; tr = allRowArr[i]; i++) {
                                if(tr.getElementsByTagName('td').length || !tr.getElementsByTagName('th').length) continue;
                                rowArr[rowArr.length] = tr.getElementsByTagName('th');
                                for(var j = 0, th; th = rowArr[rowArr.length - 1][j]; j++) {
                                        if(th.className.search(/sortable/) != -1) sortableTable = true;
                                }
                        }

                        if(!sortableTable) continue;

                        if(!tbl.id) tbl.id = "fd-table-" + fdTableSort.uniqueHash++;

                        sortable  = false;
                        columnNum = tbl.className.search(/sortable-onload-([0-9]+)/) != -1 ? parseInt(tbl.className.match(/sortable-onload-([0-9]+)/)[1]) - 1 : -1;
                        showArrow = tbl.className.search(/no-arrow/) == -1;
                        reverse   = tbl.className.search(/sortable-onload-([0-9]+)-reverse/) != -1;

                        rowLength = rowArr[0].length;

                        for(var c = 0;c < rowArr[0].length;c++){
                                if(rowArr[0][c].getAttribute(fdTableSort.colspan) && rowArr[0][c].getAttribute(fdTableSort.colspan) > 1){
                                        rowLength = rowLength + (rowArr[0][c].getAttribute(fdTableSort.colspan) - 1);
                                };
                        };

                        workArr = new Array(rowArr.length);

                        for(var c = rowArr.length;c--;){
                                workArr[c]= new Array(rowLength);
                        };

                        for(var c = 0;c < workArr.length;c++){
                                celCount = 0;
                                for(var i = 0;i < rowLength;i++){
                                        if(!workArr[c][i]){
                                                cel = rowArr[c][celCount];
                                                colspan = (cel.getAttribute(fdTableSort.colspan) > 1) ? cel.getAttribute(fdTableSort.colspan):1;
                                                rowspan = (cel.getAttribute(fdTableSort.rowspan) > 1) ? cel.getAttribute(fdTableSort.rowspan):1;
                                                for(var t = 0;((t < colspan)&&((i+t) < rowLength));t++){
                                                        for(var n = 0;((n < rowspan)&&((c+n) < workArr.length));n++) {
                                                                workArr[(c+n)][(i+t)] = cel;
                                                        };
                                                };
                                                if(++celCount == rowArr[c].length) break;
                                        };
                                };
                        };

                        for(var c = 0;c < workArr.length;c++) {
                                for(var i = 0;i < workArr[c].length;i++){

                                        if(workArr[c][i].className.search("fd-column-") == -1 && workArr[c][i].className.search("sortable") != -1) workArr[c][i].className = workArr[c][i].className + " fd-column-" + i;

                                        if(workArr[c][i].className.match('sortable')) {
                                                workArr[c][i].className = workArr[c][i].className.replace(/forwardSort|reverseSort/, "");

                                                if(i == columnNum) sortable = workArr[c][i];
                                                thtext = fdTableSort.getInnerText(workArr[c][i]);

                                                if(workArr[c][i].getElementsByClassName && workArr[c][i].getElementsByClassName('a')) {
                                                        workArr[c][i].getElementsByClassName('a')[0].onclick = workArr[c][i].getElementsByClassName('a')[0].onkeypress = null;
                                                }
                                                        
                                                while(workArr[c][i].firstChild) workArr[c][i].removeChild(workArr[c][i].firstChild);

                                                // Create the link
                                                aclone = a.cloneNode(true);
                                                aclone.appendChild(document.createTextNode(thtext));
                                                aclone.title = "Sort on " + thtext;
                                                aclone.onclick = workArr[c][i].onclick = fdTableSort.clickWrapper;
                                                workArr[c][i].appendChild(aclone);

                                                // Add the span if needs be
                                                if(showArrow) workArr[c][i].appendChild(span.cloneNode(false));

                                                workArr[c][i].className = workArr[c][i].className.replace(/fd-identical|fd-not-identical/, "");
                                                fdTableSort.disableSelection(workArr[c][i]);
                                                aclone = null;
                                        };
                                };
                        };

                        fdTableSort.tmpCache[tbl.id] = {cols:rowLength, headers:workArr};

                        workArr = null;

                        if(sortable) {
                                onLoadTables[onLoadTables.length] = sortable;
                                if(reverse) { onLoadTables[onLoadTables.length] = sortable; };
                        };
                };

                for(var i = 0, thNode; thNode = onLoadTables[i]; i++) {
                        fdTableSort.thNode = thNode;
                        fdTableSort.initSort(false);
                };
                
                aclone = a.onkeypress = a = span = workArr = sortable = thNode = onLoadTables = tbl = allRowArr = rowArr = null;
        },
        
        disableSelection: function(element) {
                element.onselectstart = function() {
                        return false;
                };
                element.unselectable = "on";
                element.style.MozUserSelect = "none";
        },

        clickWrapper: function(e) {
                e = e || window.event;
                if(fdTableSort.thNode == null) {
                        var targ = this;
                        while(targ.tagName.toLowerCase() != "th") targ = targ.parentNode;
                        fdTableSort.thNode = targ;
                        fdTableSort.addSortActiveClass();
                        setTimeout(fdTableSort.initSort,5,false);
                };
                return fdTableSort.stopEvent(e);
        },

        keyWrapper: function(e) {
                e = e || window.event;
                var kc = e.keyCode != null ? e.keyCode : e.charCode;
                if(kc == 13) {
                        var targ = this;
                        while(targ.tagName.toLowerCase() != "th") targ = targ.parentNode;
                        fdTableSort.thNode = targ;
                        fdTableSort.addSortActiveClass();
                        setTimeout(fdTableSort.initSort,5,false);
                        return fdTableSort.stopEvent(e);
                };
                return true;
        },

        jsWrapper: function(tableid, colNum) {
                if(!fdTableSort.tmpCache[tableid] || fdTableSort.tmpCache[tableid].headers[0].length <= colNum || fdTableSort.tmpCache[tableid].headers[0][colNum].className.search(/fd-column/) == -1) return false;
                fdTableSort.thNode = fdTableSort.tmpCache[tableid].headers[0][colNum];
                fdTableSort.initSort(true);
        },

        addSortActiveClass: function() {
                if(fdTableSort.thNode == null) return;
                fdTableSort.addClass(fdTableSort.thNode, "sort-active");
                fdTableSort.addClass(document.getElementsByTagName('body')[0], "sort-active");
                var tableElem = fdTableSort.thNode;
                while(tableElem.tagName.toLowerCase() != 'table' && tableElem.parentNode) {
                        tableElem = tableElem.parentNode;
                };
                if("sortInitiatedCallback-" + tableElem.id in window) {
                        window["sortInitiatedCallback-" + tableElem.id]();
                } else if("sortInitiatedCallback" in window) {
                        sortInitiatedCallback(tableElem.id);
                };
        },

        removeSortActiveClass: function() {
                fdTableSort.removeClass(fdTableSort.thNode, "sort-active");
                fdTableSort.removeClass(document.getElementsByTagName('body')[0], "sort-active");
                var tableElem = fdTableSort.thNode;
                while(tableElem.tagName.toLowerCase() != 'table' && tableElem.parentNode) {
                        tableElem = tableElem.parentNode;
                };
                if("sortCompleteCallback-" + tableElem.id in window) {
                        window["sortCompleteCallback-" + tableElem.id]();
                } else if("sortCompleteCallback" in window) {
                        sortCompleteCallback(tableElem.id);
                };
        },

        addClass: function(e,c) {
                if(new RegExp("(^|\\s)" + c + "(\\s|$)").test(e.className)) return;
                e.className += ( e.className ? " " : "" ) + c;
        },

        removeClass: function(e,c) {
                e.className = !c ? "" : e.className.replace(new RegExp("(^|\\s*\\b[^-])"+c+"($|\\b(?=[^-]))", "g"), "");
        },

        prepareTableData: function(table) {
                var data = [];

                var start = table.getElementsByTagName('tbody');
                start = start.length ? start[0] : table;

                var trs = start.getElementsByTagName('tr');
                var ths = table.getElementsByTagName('th');

                var numberOfRows = trs.length;
                var numberOfCols = fdTableSort.tmpCache[table.id].cols;

                var data = [];
                var identical = new Array(numberOfCols);
                var identVal  = new Array(numberOfCols);

                var tr, td, th, txt, tds, col, row;

                var re = new RegExp(/fd-column-([0-9]+)/);
                var rowCnt = 0;

                var sortableColumnNumbers = [];

                for(var tmp = 0, th; th = ths[tmp]; tmp++) {
                        if(th.className.search(re) == -1) continue;
                        sortableColumnNumbers[sortableColumnNumbers.length] = th;
                };

                // Start to create the 2D matrix of data
                for(row = 0; row < numberOfRows; row++) {

                        tr              = trs[row];

                        // Have we any th tags or are we in a tfoot ?
                        if(tr.getElementsByTagName('th').length > 0 || (tr.parentNode && tr.parentNode.tagName.toLowerCase() == "tfoot")) continue;

                        data[rowCnt]    = [];
                        tds             = tr.getElementsByTagName('td');

                        for(var tmp = 0, th; th = sortableColumnNumbers[tmp]; tmp++) {
                                col = th.className.match(re)[1];

                                td  = tds[col];

                                txt = fdTableSort.getInnerText(td) + " ";

                                txt = txt.replace(/^\s+/,'').replace(/\s+$/,'');

                                if(th.className.search(/sortable-date/) != -1) {
                                        txt = fdTableSort.dateFormat(txt, th.className.search(/sortable-date-dmy/) != -1);
                                } else if(th.className.search(/sortable-numeric|sortable-currency/) != -1) {
                                        txt = parseFloat(txt.replace(/[^0-9\.\-]/g,''));
                                        if(isNaN(txt)) txt = "";
                                } else if(th.className.search(/sortable-text/) != -1) {
                                        txt = txt.toLowerCase();
                                } else if (th.className.search(/sortable-keep/) != -1) {
                                        txt = rowCnt;
                                } else if(th.className.search(/sortable-([a-zA-Z\_]+)/) != -1) {
                                        if((th.className.match(/sortable-([a-zA-Z\_]+)/)[1] + "PrepareData") in window) {
                                                txt = window[th.className.match(/sortable-([a-zA-Z\_]+)/)[1] + "PrepareData"](td, txt);
                                        };
                                } else {
                                        if(txt != "") {
                                                fdTableSort.removeClass(th, "sortable");
                                                if(fdTableSort.dateFormat(txt) != 0) {
                                                        fdTableSort.addClass(th, "sortable-date");
                                                        txt = fdTableSort.dateFormat(txt);
                                                } else if(txt.search(fdTableSort.regExp_Number) != -1 || txt.search(fdTableSort.regExp_Currency) != -1) {
                                                        fdTableSort.addClass(th, "sortable-numeric");
                                                        txt = parseFloat(txt.replace(/[^0-9\.\-]/g,''));
                                                        if(isNaN(txt)) txt = "";
                                                } else {
                                                        fdTableSort.addClass(th, "sortable-text");
                                                        txt = txt.toLowerCase();
                                                };
                                        };
                                };

                                if(rowCnt > 0 && identVal[col] != txt) {
                                        identical[col] = false;
                                };

                                identVal[col]     = txt;
                                data[rowCnt][col] = txt;
                        };

                        // Add the tr for this row
                        data[rowCnt][numberOfCols] = tr;

                        // Increment the row count
                        rowCnt++;
                }

                // Get the row and column styles
                var colStyle = table.className.search(/colstyle-([\S]+)/) != -1 ? table.className.match(/colstyle-([\S]+)/)[1] : false;
                var rowStyle = table.className.search(/rowstyle-([\S]+)/) != -1 ? table.className.match(/rowstyle-([\S]+)/)[1] : false;

                // Cache the data object for this table
                fdTableSort.tableCache[table.id] = { data:data, identical:identical, colStyle:colStyle, rowStyle:rowStyle, noArrow:table.className.search(/no-arrow/) != -1 };

                sortableColumnNumbers = data = tr = td = th = trs = identical = identVal = null;
        },

        onUnload: function() {
                for(tbl in fdTableSort.tableCache) {
                        fdTableSort.removeTableCache(tbl);
                }
                for(tbl in fdTableSort.tmpCache) {
                        fdTableSort.removeTmpCache(tbl);
                }
                fdTableSort.removeEvent(window, "load", fdTableSort.initEvt);
                fdTableSort.removeEvent(window, "unload", fdTableSort.onUnload);
                fdTableSort.tmpCache = fdTableSort.tableCache = null;
        },
        
        removeTableCache: function(tableId) {
                if(!(tableId in fdTableSort.tableCache)) return;

                var data = fdTableSort.tableCache[tableId].data;
                for(var i = 0, row; row = data[i]; i++) {
                        row[row.length - 1] = null;
                }
                data = row = null;
                fdTableSort.tableCache[tableId] = null;
                delete fdTableSort.tableCache[tableId];
                
                var tbl = document.getElementById(tableId);
                if(!tbl) return;
                var ths = tbl.getElementsByTagName("th");
                var a;
                for(var i = 0, th; th = ths[i]; i++) {
                        a = th.getElementsByTagName("a");
                        if(a.length) a[0].onkeypress = a[0].onclick = null;
                        th.onclick = th.onselectstart = th = a = null;
                }
        },
        
        removeTmpCache: function(tableId) {
                if(!(tableId in fdTableSort.tmpCache)) return;
                var headers = fdTableSort.tmpCache[tableId].headers;
                var a
                for(var i = 0, row; row = headers[i]; i++) {
                        for(var j = 0, th; th = row[j]; j++) {
                                a = th.getElementsByTagName("a");
                                if(a.length) a[0].onkeypress = a[0].onclick = null;
                                th.onclick = th.onselectstart = th = a = null;
                        }
                }
                fdTableSort.tmpCache[tableId] = null;
                delete fdTableSort.tmpCache[tableId];
        },
        
        initSort: function(noCallback) {

                var span;
                var thNode      = fdTableSort.thNode;

                // Get the table
                var tableElem   = fdTableSort.thNode;
                while(tableElem.tagName.toLowerCase() != 'table' && tableElem.parentNode) {
                        tableElem = tableElem.parentNode;
                };

                // If this is the first time that this table has been sorted, create the data object
                if(!tableElem.id || !(tableElem.id in fdTableSort.tableCache)) {
                        fdTableSort.prepareTableData(tableElem);
                };
                
                // Cache the table id
                fdTableSort.tableId = tableElem.id;

                // Get the column position using the className added earlier
                fdTableSort.pos = thNode.className.match(/fd-column-([0-9]+)/)[1];

                // Grab the data object for this table
                var dataObj     = fdTableSort.tableCache[tableElem.id];

                // Get the position of the last column that was sorted
                var lastPos     = dataObj.pos ? dataObj.pos.className.match(/fd-column-([0-9]+)/)[1] : -1;

                // Get the stored data object for this table
                var data        = dataObj.data;
                var colStyle    = dataObj.colStyle;
                var rowStyle    = dataObj.rowStyle;
                var len1        = data.length;
                var len2        = data.length > 0 ? data[0].length - 1 : 0;
                var identical   = dataObj.identical[fdTableSort.pos];
                var noArrow     = dataObj.noArrow;

                if(lastPos != fdTableSort.pos && lastPos != -1) {
                        var th = dataObj.pos;
                        fdTableSort.removeClass(th, "(forwardSort|reverseSort)");

                        if(!noArrow) {
                                // Remove arrow
                                span = th.getElementsByTagName('span')[0];
                                while(span.firstChild) span.removeChild(span.firstChild);
                        };
                };

                // If the same column is being sorted then just reverse the data object contents.
                var classToAdd = "forwardSort";

                if((lastPos == fdTableSort.pos && !identical) || (thNode.className.search(/sortable-keep/) != -1 && lastPos == -1)) {
                        data.reverse();
                        classToAdd = thNode.className.search(/reverseSort/) != -1 ? "forwardSort" : "reverseSort";
                        if(thNode.className.search(/sortable-keep/) != -1 && lastPos == -1) fdTableSort.tableCache[tableElem.id].pos = thNode;
                } else {
                        fdTableSort.tableCache[tableElem.id].pos = thNode;
                        if(!identical) {
                                if(thNode.className.match(/sortable-(numeric|currency|date|keep)/)) {
                                        data.sort(fdTableSort.sortNumeric);
                                } else if(thNode.className.match('sortable-text')) {
                                        data.sort(fdTableSort.sortText);
                                } else if(thNode.className.search(/sortable-([a-zA-Z\_]+)/) != -1 && thNode.className.match(/sortable-([a-zA-Z\_]+)/)[1] in window) {
                                        data.sort(window[thNode.className.match(/sortable-([a-zA-Z\_]+)/)[1]]);
                                };
                        };
                };

                fdTableSort.removeClass(thNode, "(forwardSort|reverseSort)");
                fdTableSort.addClass(thNode, classToAdd);

                if(!noArrow) {
                        var arrow = thNode.className.search(/forwardSort/) != -1 ? " \u2193" : " \u2191";
                        span = thNode.getElementsByTagName('span')[0];
                        while(span.firstChild) span.removeChild(span.firstChild);
                        span.appendChild(document.createTextNode(arrow));
                };

                if(!rowStyle && !colStyle && identical) {
                        if(!noCallback) fdTableSort.removeSortActiveClass();
                        fdTableSort.thNode = null;
                        return;
                }

                var hook = tableElem.getElementsByTagName('tbody');
                hook = hook.length ? hook[0] : tableElem;

                var tr, tds;
                var rowReg = rowStyle ? new RegExp("(^|\\s*\\b[^-])"+rowStyle+"($|\\b(?=[^-]))", "g") : false;
                var colReg = colStyle ? new RegExp("(^|\\s*\\b[^-])"+colStyle+"($|\\b(?=[^-]))", "g") : false;

                for(var i = 0; i < len1; i++) {
                        tr = data[i][len2];
                        if(colStyle) {
                                tds = tr.getElementsByTagName('td');
                                if(lastPos != -1) {
                                        tds[lastPos].className = tds[lastPos].className.replace(colReg, "");
                                }
                                fdTableSort.addClass(tds[fdTableSort.pos], colStyle);
                                tds = null;
                        };
                        if(!identical) {
                                if(rowStyle) {
                                        if(i % 2) fdTableSort.addClass(tr, rowStyle);
                                        else tr.className = tr.className.replace(rowReg, "");
                                };

                                hook.removeChild(tr); // Netscape 8.1.2 requires the removeChild call
                                hook.appendChild(tr);
                        };
                        tr = null;
                };
                if(!noCallback) fdTableSort.removeSortActiveClass();
                fdTableSort.thNode = hook = null;
        },

        getInnerText: function(el) {
                if (typeof el == "string" || typeof el == "undefined") return el;
                if(el.innerText) return el.innerText;

                var txt = '', i;
                for (i = el.firstChild; i; i = i.nextSibling) {
                        if (i.nodeType == 3)            txt += i.nodeValue;
                        else if (i.nodeType == 1)       txt += fdTableSort.getInnerText(i);
                };
                return txt;
        },

        dateFormat: function(dateIn, favourDMY) {
                var dateTest = [
                        { regExp:/^(0?[1-9]|1[012])([- \/.])(0?[1-9]|[12][0-9]|3[01])([- \/.])((\d\d)?\d\d)$/, d:3, m:1, y:5 },  // mdy
                        { regExp:/^(0?[1-9]|[12][0-9]|3[01])([- \/.])(0?[1-9]|1[012])([- \/.])((\d\d)?\d\d)$/, d:1, m:3, y:5 },  // dmy
                        { regExp:/^(\d\d\d\d)([- \/.])(0?[1-9]|1[012])([- \/.])(0?[1-9]|[12][0-9]|3[01])$/, d:5, m:3, y:1 }   // ymd
                        ];
                var start;
                var cnt = 0;
                var numFormats = dateTest.length;
                while(cnt < numFormats) {
                        start = (cnt + (favourDMY ? numFormats + 1 : numFormats)) % numFormats;

                        if(dateIn.match(dateTest[start].regExp)) {
                                res = dateIn.match(dateTest[start].regExp);
                                y = res[dateTest[start].y];
                                m = res[dateTest[start].m];
                                d = res[dateTest[start].d];
                                if(m.length == 1) m = "0" + String(m);
                                if(d.length == 1) d = "0" + String(d);
                                if(y.length != 4) y = (parseInt(y) < 50) ? "20" + String(y) : "19" + String(y);

                                return y+String(m)+d;
                        }
                        cnt++;
                }
                return 0;
        },

        sortDate: function(a,b) {
                var aa = a[fdTableSort.pos];
                var bb = b[fdTableSort.pos];
                return aa - bb;
        },

        sortNumeric:function (a,b) {
                var aa = a[fdTableSort.pos];
                var bb = b[fdTableSort.pos];
                if(aa == bb) return 0;
                if(aa === "" && !isNaN(bb)) return -1;
                if(bb === "" && !isNaN(aa)) return 1;
                return aa - bb;
        },

        sortText:function (a,b) {
                var aa = a[fdTableSort.pos];
                var bb = b[fdTableSort.pos];
                if(aa == bb) return 0;
                if(aa < bb)  return -1;
                return 1;
        }
};

fdTableSort.addEvent(window, "load", fdTableSort.initEvt);
fdTableSort.addEvent(window, "unload", fdTableSort.onUnload);


function sortImage(a, b) { return fdTableSort.sortText(a, b); }

/*
        This is the function used to prepare i.e. parse data, to be used during the sort
        of the images within the last table.

        In this case, we are checking to see if the TD node has any child nodes that are
        images and, if an image exists, return it's "src" attribute.
        If no image exists, then we return an empty string.

        The "prepareData" functions are passed the actual TD node and also the TD node inner text
        which means you are free to check for child nodes etc and are not just limited to
        sorting on the TD node's inner text.

        The prepareData functions are not required (only your bespoke sort function is required)
        and only called by the script should they exist.
*/
function sortImagePrepareData(td, innerText) {
        var img = td.getElementsByTagName('img');
        return img.length ? img[0].src: "";
}