var BrName=navigator.appName;
var BrVersion=parseInt(navigator.appVersion);
var BrRollover=false;
if ((BrName=="Netscape" && BrVersion>=3) ||
	(BrName=="Microsoft Internet Explorer" && BrVersion>=3))
	BrRollover = true;
var gallery_on, gallery_off, 
	teaching_on, teaching_off, research_on, research_off;
if (BrRollover)
{
	
	
	teaching_on=new Image();
	teaching_on.src = "teaching_on.jpg";
	research_on=new Image();
	research_on.src = "research_on.jpg";
        gallery_on=new Image();
	gallery_on.src = "gallery_on.jpg";

	
	teaching_off=new Image();
	teaching_off.src = "teaching_off.jpg";
	research_off=new Image();
	research_off.src = "research_off.jpg";
        gallery_off=new Image();
	gallery_off.src = "gallery_off.jpg";

}
function over(imgName)
{
	if (BrRollover)
	{	
		var imgObj, tempObj;
		imgObj=eval('document.img_'+ imgName);
		tempObj = eval(imgName + '_on');
		imgObj.src = tempObj.src;
	}
}
function out(imgName)
{
	if (BrRollover)
	{
		var imgObj, tempObj;	
		imgObj=eval('document.img_'+ imgName)
		tempObj = eval(imgName + '_off');
		imgObj.src = tempObj.src;
	}
}