function roll_over(img_name, img_src){
	document[img_name].src = img_src;
}
function popupPic(dest,popname,width,height){
		popup=window.open(dest,popname,"left="+ (((800-width)/2)) + ",top=" + (((600-height)/2)) +",width="+width+",height="+height+",resizable=no,menubar=0,scrollbars=no,location=no,alwaysRaised=yes");
		popup.focus()
	}