(function($) {
  var cache = [];
  // Arguments are image paths relative to the current page.
  $.preLoadImages = function() {
    var args_len = arguments.length;
    for (var i = args_len; i--;) {
      var cacheImage = document.createElement('img');
      cacheImage.src = arguments[i];
      cache.push(cacheImage);
    }
  }
})(jQuery)

jQuery.preLoadImages("images/btn_1_over.gif", "images/btn_2_over.gif", "images/btn_3_over.gif", "images/btn_4_over.gif", "images/btn_5_over.gif", "images/btn_6_over.gif", "images/btn_7_over.gif", "images/btn_8_over.gif", "images/btn_1.gif", "images/btn_2.gif", "images/btn_3.gif", "images/btn_4.gif", "images/btn_5.gif", "images/btn_6.gif", "images/btn_7.gif", "images/btn_8.gif");