if (document.images) {
        var home_lo = new Image();
        home_lo.src = "images/menu/home-off.gif";
        var home_hi = new Image();
        home_hi.src = "images/menu/home-on.gif";

        var classes_lo = new Image();
        classes_lo.src = "images/menu/classes-off.gif";
        var classes_hi = new Image();
        classes_hi.src = "images/menu/classes-on.gif";   

        var newsletter_lo = new Image();
        newsletter_lo.src = "images/menu/newsletter-off.gif";
        var newsletter_hi = new Image();
        newsletter_hi.src = "images/menu/newsletter-on.gif";

        var store_lo = new Image();
        store_lo.src = "images/menu/store-off.gif";
        var store_hi = new Image();
        store_hi.src = "images/menu/store-on.gif";  
                                                 
}

function hiLite(imgName) {
        if (document.images) 
        document[imgName].src = eval(imgName + '_hi.src');
        }

function norm(imgName) {
        if (document.images)
        document[imgName].src = eval(imgName + '_lo.src');
        }