(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)


$(document).ready(function () {
     jQuery.preLoadImages('images/about_us2.gif','images/trade2.gif','images/contact_us2.gif','images/our_toothpaste2.gif');

    $(".menulink").mouseover(function() {
        var theImage=$(this).find("img");
        var oldSrc=theImage.attr("src");
        var newSrc=oldSrc.replace(".gif","2.gif");
        theImage.attr("src",newSrc);
    });
    $(".menulink").mouseout(function() {
        var theImage=$(this).find("img");
        var oldSrc=theImage.attr("src");
        var newSrc=oldSrc.replace("2.gif",".gif");
        theImage.attr("src",newSrc);
    });
});