function zoom(catcode,item_num,wwidth,wheight,iroot) {

	var win = null;
	win=window.open("zoom.cfm?iroot="+iroot+"&zoomfile="+catcode+"&I="+item_num,"PictureWindow","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width="+wwidth+",height="+wheight+",left=0,top=0");
}