if (document.images) 
{
   img1 = new Image();
   img2 = new Image();
   img3 = new Image();
   img4 = new Image();
   img5 = new Image();
   img1.src = "images/icon-tour-on.gif";
   img2.src = "images/icon-packages-on.gif";
   img3.src = "images/icon-gift-cards-on.gif";
   img4.src = "images/icon-weather-on.gif";
   img5.src = "images/icon-enews-on.gif";
}