if(document.images)
{
  var image_array = new Array();
	
  // path to the directory with images
  var path = '/templates/front/default/images/';

  // enumeration of the "active" images
  image_array[0] = path + "home-main-menu-button-about-rollover.gif";
  image_array[1] = path + "home-main-menu-button-home-rollover.gif";

  var preload_image = new Array ();
 
  for(var i=0; i<image_array.length; i++)
  {
    preload_image[i]= new Image();
    preload_image[i].src = image_array[i];
  }
}

function rollover(name, filename)
{
  var fullpath = '/templates/front/default/images/' + filename;
  document.images[name].src = fullpath;
}