var imgover="start";
function highlight(imgname)
{
	myImage = new Image();
	myImage.src ="images/" + imgname + "-thumbon.jpg";
	document.getElementById(imgname).src = myImage.src;
	largeImage = new Image();
	largeImage.src ="images/" + imgname + ".jpg";
	document.getElementById("largepic").src = largeImage.src;
}

function nohighlight(imgname)
{
	myImage = new Image();
	myImage.src ="images/" + imgname + "-thumb.jpg";
	document.getElementById(imgname).src = myImage.src;
}

function changepic(imgname)
{
	if (imgover != imgname && imgover !="start")
	{
	    nohighlight(imgover);
	}
	imgover = imgname;
	highlight(imgname);	
}

function switchimage(which){
	if (document.getElementById) {
		document.getElementById("picdesc").innerHTML=infotitle[which];
		changepic(infopic[which]);
	}
}