function positionTop(element) {
	return positionLeft(element);
}
 
var rosterTables = new Array();
 
function initializeRosterTables(){
	var f = document.forms[0];
	if (f.FloatingRostersTableHeaders.value!='Yes') return;
 
	if (document.getElementById('bRosterTable_Head1'))
	{
		var table1Headers = new Array();
		table1Headers[0] = document.getElementById('bRosterTable_Head1');
		table1Headers[1] = document.getElementById('bRosterTable_Head2');
		table1Headers[2] = document.getElementById('bRosterTable_Head3');
		rosterTables[0] = {table:document.getElementById('bRosterTable'), headers : table1Headers, topShift : 0};
	}
	var table2Headers = new Array();
	table2Headers[0] = document.getElementById('eRosterTable_Head1');
	table2Headers[1] = document.getElementById('eRosterTable_Head2');
	var eRosterShift = -2;
	if (f.eRostView.value != "byName") eRosterShift = -14;
	if (document.getElementById('bRosterTable_Head1')){
		rosterTables[1] = {table:document.getElementById('eRosterTable'), headers : table2Headers, topShift : eRosterShift};
	} else {		
		rosterTables[0] = {table:document.getElementById('eRosterTable'), headers : table2Headers, topShift : eRosterShift};	
	}
	for(var i = 0; i < rosterTables.length; i++){
		for(var j=0; j<rosterTables[i].headers.length; j++) {
			if (rosterTables[i].headers[j]) rosterTables[i].headers[j].style.position = 'relative';
		}
	}
}
 
function onScrollCustom(){
 
	if (document.forms[0].FloatingRostersTableHeaders.value!='Yes') return;
	var scrollTop = document.body.scrollTop;
 
	for(var i = 0; i < rosterTables.length; i++){
		var tablePositionTop = positionTop(rosterTables[i].table);
 
		var tableHeadersHeight = 0;
		for(var j=0; j<rosterTables[i].headers.length; j++) 
			if (rosterTables[i].headers[j]) tableHeadersHeight += rosterTables[i].headers[j].offsetHeight;
 
		if((scrollTop > tablePositionTop - rosterTables[i].topShift) && (scrollTop < (tablePositionTop + rosterTables[i].table.offsetHeight - tableHeadersHeight))){
			for(var j=0; j<rosterTables[i].headers.length; j++) {
				var units = (typeof scrollTop == "string") ? "px" : 0;
				if (rosterTables[i].headers[j]) rosterTables[i].headers[j].style.top = scrollTop - tablePositionTop + rosterTables[i].topShift + units;
				}
		} else {
			for(var j=0; j<rosterTables[i].headers.length; j++)
				if (rosterTables[i].headers[j]) rosterTables[i].headers[j].style.top = 0;
		}
	} 
}
 
function onExpandCategory(){
	if (document.forms[0].FloatingRostersTableHeaders.value!='Yes') return;
	for(var i = 0; i < rosterTables.length; i++){
		for(var j=0; j<rosterTables[i].headers.length; j++) {
			if (rosterTables[i].headers[j]) rosterTables[i].headers[j].style.position = 'absolute';
			if (rosterTables[i].headers[j]) rosterTables[i].headers[j].style.position = 'relative';
		}
	}
}