if (document.images) {
    name1on  = new Image();name1on.src  = 'images/what-we-offer-h.jpg'; name1off  = new Image();name1off.src  = 'images/what-we-offer-n.jpg';
    name2on  = new Image();name2on.src  = 'images/course-features-h.jpg'; name2off  = new Image();name2off.src  = 'images/course-features-n.jpg';
    name3on  = new Image();name3on.src  = 'images/bartending-resources-h.jpg'; name3off  = new Image();name3off.src  = 'images/bartending-resources-n.jpg';
    name4on  = new Image();name4on.src  = 'images/bartenders-for-hire-h.jpg'; name4off  = new Image();name4off.src  = 'images/bartenders-for-hire-n.jpg';
    name5on  = new Image();name5on.src  = 'images/contact-h.jpg'; name5off  = new Image();name5off.src  = 'images/contact-n.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');
}