function doZoom(what,w,h,root) {

	var scroll=0;

	if (w>screen.width) {

		w=screen.width;

		scroll=1;

	}

	if (h>screen.height) {

		h=screen.height;

		scroll=1;

	}



	var left = (screen.width/2) - w/2;

  	var top = (screen.height/2) - h/2;



	var opt='toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars='+scroll+',height='+h+',width='+w+',top='+top+',left='+left;



	var wnd= window.open(root+'zoom.php?name='+what,'',opt);

	wnd.focus();

}