if (document.images) {

nav_home_on = new Image();
nav_home_on.src = "/br/vision/images/navigation/nav_home_on.gif";
nav_home_off = new Image();
nav_home_off.src = "/br/vision/images/navigation/nav_home_off.gif";

nav_faqs_on = new Image();
nav_faqs_on.src = "/br/vision/images/navigation/nav_faqs_on.gif";
nav_faqs_off = new Image();
nav_faqs_off.src = "/br/vision/images/navigation/nav_faqs_off.gif";

nav_contact_on = new Image();
nav_contact_on.src = "/br/vision/images/navigation/nav_contact_on.gif";
nav_contact_off = new Image();
nav_contact_off.src = "/br/vision/images/navigation/nav_contact_off.gif";

nav_about_on = new Image();
nav_about_on.src = "/br/vision/images/navigation/nav_about_on.gif";
nav_about_off = new Image();
nav_about_off.src = "/br/vision/images/navigation/nav_about_off.gif";

nav_sitemap_on = new Image();
nav_sitemap_on.src = "/br/vision/images/navigation/nav_sitemap_on.gif";
nav_sitemap_off = new Image();
nav_sitemap_off.src = "/br/vision/images/navigation/nav_sitemap_off.gif";

nav_infants_on = new Image();
nav_infants_on.src = "/br/vision/images/navigation/nav_infants_on.gif";
nav_infants_off = new Image();
nav_infants_off.src = "/br/vision/images/navigation/nav_infants_off.gif";

nav_children_on = new Image();
nav_children_on.src = "/br/vision/images/navigation/nav_children_on.gif";
nav_children_off = new Image();
nav_children_off.src = "/br/vision/images/navigation/nav_children_off.gif";

nav_teens_on = new Image();
nav_teens_on.src = "/br/vision/images/navigation/nav_teens_on.gif";
nav_teens_off = new Image();
nav_teens_off.src = "/br/vision/images/navigation/nav_teens_off.gif";

nav_20s_on = new Image();
nav_20s_on.src = "/br/vision/images/navigation/nav_20s_on.gif";
nav_20s_off = new Image();
nav_20s_off.src = "/br/vision/images/navigation/nav_20s_off.gif";

nav_40s_on = new Image();
nav_40s_on.src = "/br/vision/images/navigation/nav_40s_on.gif";
nav_40s_off = new Image();
nav_40s_off.src = "/br/vision/images/navigation/nav_40s_off.gif";

nav_seniors_on = new Image();
nav_seniors_on.src = "/br/vision/images/navigation/nav_seniors_on.gif";
nav_seniors_off = new Image();
nav_seniors_off.src = "/br/vision/images/navigation/nav_seniors_off.gif";

}



function roll_down(image_name) {
        var img_src = eval(image_name+"_on.src");
        document.images[image_name].src = img_src;
		}

function roll_up(image_name) {
        var img_src = eval(image_name+"_off.src");
        document.images[image_name].src = img_src;
		}