function doZoom(what,w,h) {
	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('zoom.php?name='+what,'',opt);
	wnd.focus();
}