hi_about_img = new Image();
hi_about_img.src = "images/about2.gif";
hi_home_img = new Image();
hi_home_img.src = "images/home2.gif";
hi_download_img = new Image();
hi_download_img.src = "images/download2.gif";
hi_purchase_img = new Image();
hi_purchase_img.src = "images/purchase2.gif";
hi_support_img = new Image();
hi_support_img.src = "images/support2.gif";