if (document.images)
        {
                nav_abouton = new Image;
                nav_abouton.src = "images/nav_about-on.png";  
                nav_aboutoff = new Image;
                nav_aboutoff.src = "images/nav_about-off.png";
        
                nav_menuon = new Image;
                nav_menuon.src = "images/nav_menu-on.png";  
                nav_menuoff = new Image;
                nav_menuoff.src = "images/nav_menu-off.png";
                
                nav_cateringon = new Image;
                nav_cateringon.src = "images/nav_catering-on.png";  
                nav_cateringoff = new Image;
                nav_cateringoff.src = "images/nav_catering-off.png";      
                
                nav_contacton = new Image;
                nav_contacton.src = "images/nav_contact-on.png";  
                nav_contactoff = new Image;
                nav_contactoff.src = "images/nav_contact-off.png"; 



        }
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;
                }
        }

//-->