if (document.images) {  
    blogo = new Image (760.54); blogo.src = "graphics/Ban_1.jpg";
    blogoover = new Image (760.54); blogoover.src = "graphics/Ban_2.jpg";
}
function chgImg3(name, image) {
    if (document.images) {
        document[name].src = eval(image+".src");
    };
}