function image_popup(name, width, height) 
{
  var w = width + 50;
  var h = height + 50;
  var x = (screen.width - w) / 2;
  var y = (screen.height - h) / 2;
  var features="height="+h+",width="+w+"screenX="+x+",screenY="+y;
  
  window.open("/popup.rxml?name="+name, "", features);
};