function zoom_photo(url,width,height) 
{
 if ( (width <= window.screen.availWidth) && (height <= window.screen.availHeight) )
  {
   w=width;h=height;			
  }
  else if(width>height)
  { w=window.screen.availWidth-10;h=Math.ceil(w*height/width);			
   if(h>window.screen.availHeight-35) {h=window.screen.availHeight-35;}
   }
   else
	{
	h=(window.screen.availHeight-35);w=Math.ceil(width*h/height);						
	}
wnd=window.open(url+'&width='+w+'&height='+h,'popupWindow','left=0,top=0,menubar=no,resizable=no,status=no,toolbar=no,location=no,scrollbars=no,width=' + w +',height=' + h);
		wnd.focus();
}