function PreloadImages()
{
 if (document.images)
 {
  var imgFiles = PreloadImages.arguments;
  var preloadArray = new Array();
  for (var i=0; i<imgFiles.length; i++)
  {
   preloadArray[i] = new Image;
   preloadArray[i].src = imgFiles[i];
  }
  }
}
PreloadImages('images/menu.jpg');