if (document.images)
{
  var portal_url = "http://www.nczoo.com";

  imageNames = new Array ("home_join_icon","home_adopt_icon","home_give_icon");
  onImages = new Array (imageNames.length);

  for (n = 0; n < imageNames.length; n++)
  {
    onImages[n] = new Image();
    onImages[n].src = portal_url + "/graphics/swaps/" + imageNames[n] + "_on.gif";
  }

}

function swapOn (name)
{
  if ( document.images )
  {
    document.images[name].src = portal_url + "/graphics/swaps/" + name + "_on.gif";
  }
}

function swapOff (name)
{
  if ( document.images )
  {
    document.images[name].src = portal_url + "/graphics/swaps/" + name + "_off.gif";
  }
}