function popup1(image,caption)
  { 
  // 'click to enlarge'
  if (document.all)
        var xMax = screen.width, yMax = screen.height;
  else
        if (document.layers)
            var xMax = window.outerWidth, yMax = window.outerHeight;
        else
            var xMax = 800, yMax=600;
    var xOffset = (xMax - 520)/2, yOffset = (yMax - 550)/2;
  loc = "includes/popup1.php?image=" + image + "&caption=" + caption;

  details = "width=520,height=570,resizable=no,screenX=" +xOffset+ ",screenY=" +yOffset+ ",top=" +yOffset+ ",left=" +xOffset;
  remote = window.open(loc,"enlarged",details);
  remote.opener.name = "opener";

  remote.focus();
  return false;
  }