function hlItem(img)
{
	var fileName = img.src;
	var pos = fileName.indexOf("-g");
	fileName = fileName.substring(0,pos) + ".gif";
	
	img.src = fileName;
}

function uhlItem(img)
{
	var fileName = img.src;
	var pos = fileName.indexOf(".gif");
	fileName = fileName.substring(0,pos) + "-g.gif";
	
	img.src = fileName;
}

function mapMenu(fileName)
{
	document.mainDisplay.src = "Images/" + fileName;
}

function switchMap(negName,whichMap)
{
	document.thumbNails.src = "Images/Thumbs/" + negName;
	document.thumbNails.useMap = "#" + whichMap;
}

//Cross Browser Event Attachment
function addEvent(obj,evntType,fn,useCapture)
{
	obj = document.getElementById(obj);
	
	if(obj.addEventListener)
	{
		obj.addEventListener(evntType,fn,useCapture);
		return true;
	}
	else if( obj.attachEvent )
	{
		var rtn = obj.attachEvent("on" + evntType,fn);
		return rtn;
	}
	else
	{
		alert("Unable to attach event " + fn + " to " + evntType);
	}
}