if (document.images) {
        		
        img1on = new Image();
        img1on.src = "/images/nav_btn_home_on.gif";
        img1off = new Image();
        img1off.src = "/images/nav_btn_home_off.gif";

        img2on = new Image();
        img2on.src = "/images/nav_btn_props_on.gif";
        img2off = new Image();
        img2off.src = "/images/nav_btn_props_off.gif";

        img3on = new Image();
        img3on.src = "/images/nav_btn_resources_on.gif";
        img3off = new Image();
        img3off.src = "/images/nav_btn_resources_off.gif";

        img4on = new Image();
        img4on.src = "/images/nav_btn_dict_on.gif";
        img4off = new Image();
        img4off.src = "/images/nav_btn_dict_off.gif";

        img5on = new Image();
        img5on.src = "/images/nav_btn_profile_on.gif";
        img5off = new Image();
        img5off.src = "/images/nav_btn_profile_off.gif";
				
        img6on = new Image();
        img6on.src = "/images/nav_btn_contact_on.gif";
        img6off = new Image();
        img6off.src = "/images/nav_btn_contact_off.gif";
				
        img7on = new Image();
        img7on.src = "/images/nav_btn_sales_on.gif";
        img7off = new Image();
        img7off.src = "/images/nav_btn_sales_off.gif";
                                                 
}
function imgSwap (imgName,imgFile)  { 
        if (document.images)  {
                document.images[imgName].src = eval (imgFile + ".src");
        }
}