if (document.images) {
    name1on  = new Image();name1on.src  = '/images/home-h.jpg'; name1off  = new Image();name1off.src  = '/images/home.jpg';
    name2on  = new Image();name2on.src  = '/images/about-us-h.jpg'; name2off  = new Image();name2off.src  = '/images/about-us.jpg';
    name3on  = new Image();name3on.src  = '/images/rod-builds-h.jpg'; name3off  = new Image();name3off.src  = '/images/rod-builds.jpg';
    name4on  = new Image();name4on.src  = '/images/shop-online-h.jpg'; name4off  = new Image();name4off.src  = '/images/shop-online.jpg';
    name5on  = new Image();name5on.src  = '/images/news-h.jpg'; name5off  = new Image();name5off.src  = '/images/news.jpg';
    name6on  = new Image();name6on.src  = '/images/showroom-h.jpg'; name6off  = new Image();name6off.src  = '/images/showroom.jpg';
    name7on  = new Image();name7on.src  = '/images/contact-us-h.jpg'; name7off  = new Image();name7off.src  = '/images/contact-us.jpg';
}

function swapOn(name) {
    if (document.images)
        document.images[name].src = eval(name + 'on.src');
}

function swapOff(name) {
    if (document.images)
        document.images[name].src = eval(name + 'off.src');
}