if (document.images) {
     name1on  = new Image();name1on.src='../Medianew/homesmallON.jpg'; name1off  = new Image();name1off.src  = '../Medianew/homesmallOFF.jpg';
    name2on  = new Image();name2on.src='../Medianew/donatesmallON.jpg'; name2off  = new Image();name2off.src  = '../Medianew/donatesmallOFF.jpg';
    name3on  = new Image();name3on.src='../Medianew/volsmallON.jpg'; name3off  = new Image();name3off.src  = '../Medianew/volsmallOFF.jpg';
    name4on  = new Image();name4on.src='../Medianew/linkssmallON.jpg'; name4off  = new Image();name4off.src  = '../Medianew/linksesmallOFF.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');
}