if (document.images) {
        img1on = new Image();
        img1on.src = "/images/sp_home_on.gif";
        img1off = new Image();
        img1off.src = "/images/sp_home_off.gif";
				
        img2on = new Image();
        img2on.src = "/images/sp_about_on.gif";
        img2off = new Image();
        img2off.src = "/images/sp_about_off.gif";
				
        img3on = new Image();
        img3on.src = "/images/sp_svcs_on.gif";
        img3off = new Image();
        img3off.src = "/images/sp_svcs_off.gif";
				
        img4on = new Image();
        img4on.src = "/images/sp_port_on.gif";
        img4off = new Image();
        img4off.src = "/images/sp_port_off.gif";
				
        img5on = new Image();
        img5on.src = "/images/sp_why_on.gif";
        img5off = new Image();
        img5off.src = "/images/sp_why_off.gif";
				
        img6on = new Image();
        img6on.src = "/images/sp_contact_on.gif";
        img6off = new Image();
        img6off.src = "/images/sp_contact_off.gif";
}

function imgSwap (imgName,imgFile)  {
        if (document.images)  {
                document.images[imgName].src = eval (imgFile + ".src");
        }
}