var SORT_COLUMN_INDEX;

function ts_getInnerText(el) {
	if (typeof el == "string") return el;
	if (typeof el == "undefined") { return el };
	if (el.innerText) return el.innerText;	//Not needed but it is faster
	var str = "";
	
	var cs = el.childNodes;
	var l = cs.length;
	for (var i = 0; i < l; i++) {
		switch (cs[i].nodeType) {
			case 1: //ELEMENT_NODE
				str += ts_getInnerText(cs[i]);
				break;
			case 3:	//TEXT_NODE
				str += cs[i].nodeValue;
				break;
		}
	}
	return str;
}

function ts_resortTable(lnk) {
    // get the span
    var span;
    for (var ci=0;ci<lnk.childNodes.length;ci++) {
        if (lnk.childNodes[ci].tagName && lnk.childNodes[ci].tagName.toLowerCase() == 'span') span = lnk.childNodes[ci];
    }
    var spantext = ts_getInnerText(span);
    var td = lnk.parentNode;
    var column = td.cellIndex;
    var table = getParent(td,'TABLE');
    
    // Work out a type for the column
    if (table.rows.length <= 1) return;
    var itm = ts_getInnerText(table.rows[1].cells[column]);
    sortfn = ts_sort_caseinsensitive;
    if (itm.match(/^\d[\/-]\d\d[\/-]\d\d\d\d$/)) sortfn = ts_sort_date;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d\d\d$/)) sortfn = ts_sort_date;
    if (itm.match(/^\d\d[\/-]\d[\/-]\d\d\d\d$/)) sortfn = ts_sort_date;
    if (itm.match(/^\d[\/-]\d[\/-]\d\d\d\d$/)) sortfn = ts_sort_date;
    if (itm.match(/^[£$]/)) sortfn = ts_sort_currency;
    if (itm.match(/^[\d\.]+$/)) sortfn = ts_sort_numeric;
    if (itm == '-' ) sortfn = ts_sort_currency;
    SORT_COLUMN_INDEX = column;
    var firstRow = new Array();
    var newRows = new Array();
	var c = 0;
    for (i=0;i<table.rows[0].length;i++) { firstRow[i] = table.rows[0][i]; }
    for (j=1;j<table.rows.length;j++) {
	if (table.rows[j].className.indexOf('nosort') == -1) {
		newRows[c] = table.rows[j]; 
		c++;
	}
    }

	var d=0;
	var nosortRows = new Array();
	for ( j=1;j<table.rows.length;j++) {
		if (table.rows[j].className.indexOf('nosort') != -1) {
			nosortRows[d] = table.rows[j]; 
			d++;
		}
	}

    newRows.sort(sortfn);

    if (span.getAttribute("sortdir") == 'up') {
        ARROW = '&nbsp;&nbsp;&darr;';
        span.setAttribute('sortdir','down');
    } else {
        ARROW = '&nbsp;&nbsp;&uarr;';
        newRows.reverse();
        span.setAttribute('sortdir','up');
    }
    
    // We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
    // don't do nosort rows
    for (i=0;i<c;i++) { table.tBodies[0].appendChild(newRows[i]);}
    // do sortbottom rows only
    for (i=0;i<d;i++) { table.tBodies[0].appendChild(nosortRows[i]);}
    
    // Delete any other arrows there may be showing
    var allspans = document.getElementsByTagName("span");
    for (var ci=0;ci<allspans.length;ci++) {
        if (allspans[ci].className == 'sortarrow') {
            if (getParent(allspans[ci],"table") == getParent(lnk,"table")) { // in the same table as us?
                allspans[ci].innerHTML = '&nbsp;&nbsp;&nbsp;';
            }
        }
    }
        
    span.innerHTML = ARROW;
}

function getParent(el, pTagName) {
	if (el == null) return null;
	else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())	// Gecko bug, supposed to be uppercase
		return el;
	else
		return getParent(el.parentNode, pTagName);
}

function ts_sort_date(a,b) {
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if (aa.length == 10) {
        dt1 = aa.substr(6,4)+aa.substr(0,2)+aa.substr(3,2);
    }
    if ( aa.length == 9 ) {
	if (aa.match(/^\d[\/-]\d\d[\/-]\d\d\d\d$/)) 
		dt1 = aa.substr(5,4)+'0'+aa.substr(0,1)+aa.substr(2,2);
	else
		dt1 = aa.substr(5,4)+aa.substr(0,2)+'0'+aa.substr(3,1);
    }
    if ( aa.length == 8 ) {
	dt1 = aa.substr(4,4)+'0'+aa.substr(0,1)+'0'+aa.substr(2,1);
    }
    if (bb.length == 10) {
        dt2 = bb.substr(6,4)+bb.substr(0,2)+bb.substr(3,2);
    } 
    if ( bb.length == 9 ) {
	if (bb.match(/^\d[\/-]\d\d[\/-]\d\d\d\d$/)) 
		dt2 = bb.substr(5,4)+'0'+bb.substr(0,1)+bb.substr(2,2);
	else
		dt2 = bb.substr(5,4)+bb.substr(0,2)+'0'+bb.substr(3,1);
    }
    if ( bb.length == 8 ) {
	dt2 = bb.substr(4,4)+'0'+bb.substr(0,1)+'0'+bb.substr(2,1);
    }
//	alert( 'dt1=' + dt1 + ', dt2=' + dt2 );
    if ( dt1 == dt2 ) return 0;
    if ( dt1 < dt2 ) return -1;
    return 1;
}

function ts_sort_currency(a,b) { 
//    alert( "Currency sort" );
//    alert( "a = "+ts_getInnerText(a.cells[SORT_COLUMN_INDEX]) );
    if ( ts_getInnerText(a.cells[SORT_COLUMN_INDEX]) == '-' ) aa = 0;
    else aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g,'');
//    alert( "aa = "+aa );
    if ( ts_getInnerText(b.cells[SORT_COLUMN_INDEX]) == '-' ) bb = 0;
    else bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g,'');
    return parseFloat(aa) - parseFloat(bb);
}

function ts_sort_numeric(a,b) { 
    aa = parseFloat(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    if (isNaN(aa)) aa = 0;
    bb = parseFloat(ts_getInnerText(b.cells[SORT_COLUMN_INDEX])); 
    if (isNaN(bb)) bb = 0;
    return aa-bb;
}

function ts_sort_caseinsensitive(a,b) {
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).toLowerCase();
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).toLowerCase();
    if (aa==bb) return 0;
    if (aa<bb) return -1;
    return 1;
}

function ts_sort_default(a,b) {
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if (aa==bb) return 0;
    if (aa<bb) return -1;
    return 1;
}