var da = document.all;



  function open_new(url) {
   if (screen.height) {
      screenY = screen.height
      screenX = screen.width
   }
   var width = 900;
   if (screenY>800) var height = 800;
   else if (screenY>700) var height = 800;
   else var height = 500;

   var top = ((screenY/2)-(height/2)-200);
   var left = ((screenX/2)-(width/2)-50);
   x = window.open(url,'','menubar=yes,toolbar=yes,location=yes,directories=yes, resizable=yes,status=yes,scrollbars=yes,width='+width+',height='+height+',top='+top+',left='+left+'');
   if (x) return false;
}