if (document.images){                
               
               
               home_on = new Image;          
               home_on.src = "img/nav_home_on.gif";            
               about_on = new Image; 
               about_on.src = "img/nav_about_on.gif";
               bio_on = new Image;
               bio_on.src = "img/nav_bio_on.gif";
               gallery_on = new Image;
               gallery_on.src = "img/nav_gallery_on.gif";
               order_on = new Image;
               order_on.src = "img/nav_order_on.gif";
               link_on = new Image;
               link_on.src = "img/nav_links_on.gif";
               contact_on = new Image;
               contact_on.src = "img/nav_contact_on.gif";
              


               home_off = new Image;       
               home_off.src = "img/nav_home_off.gif";      
               about_off = new Image;
               about_off.src = "img/nav_about_off.gif";
               bio_off = new Image;
               bio_off.src = "img/nav_bio_off.gif";
               gallery_off = new Image;
               gallery_off.src = "img/nav_gallery_off.gif";
               order_off = new Image;
               order_off.src = "img/nav_order_off.gif";
               link_off = new Image;
               link_off.src = "img/nav_links_off.gif";
               contact_off = new Image;
               contact_off.src = "img/nav_contact_off.gif";
              
        }

function img_act(imgName) {
        if (document.images) {
        imgOn = eval(imgName + "_on.src");
        document [imgName].src = imgOn;
        }
}

function img_inact(imgName) {
        if (document.images) {
        imgOff = eval(imgName + "_off.src");
        document [imgName].src = imgOff;
        }
}