function doZoom(what,w,h,root) {
	if(w=='auto' || h=='auto'){
		var scroll=1;
		w=screen.width*0.75;
		h=screen.height*0.75;
		var left = (screen.width/2) - w/2;
	 	var top = (screen.height/2) - h/2;
	} else {
		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 title =$("img[@src*="+what+"]").parent().attr('title');


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

	wnd.focus();
}