// index.js
if(document.images) {
  var image_array = new Array();

  // path to the directory with images
  var path = 'images/';

  // enumeration of the "active" images
  image_array[0] = path + "menu_over_01.jpg";
  image_array[1] = path + "menu_over_02.jpg";
  image_array[2] = path + "menu_over_03.jpg";
  image_array[3] = path + "menu_over_04.jpg";
  image_array[4] = path + "menu_over_05.jpg";
  image_array[5] = path + "menu_over_06.jpg";
  image_array[6] = path + "menu_over_07.jpg";
  image_array[7] = path + "menu_over_08.jpg";
  image_array[8] = path + "menu_over_09.jpg";

  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 = 'images/' + filename;
  document.images[name].src = fullpath;
}