if (document.images)
{
preload_image = new Image();
img_path = new Array();

   img1 = new Image();
   img2 = new Image();
   img3 = new Image();
   img1.src = "/wp-content/themes/challenger-energy/library/images/nav-hover.jpg";
   img2.src = "/wp-content/themes/challenger-energy/library/images/nav-first-hover.jpg";
   img3.src = "/wp-content/themes/challenger-energy/library/images/nav-last-hover.jpg";

for(var i = 0; i<=img_path.length; i++)
preload_image.src = img_path[i];
}