function doMouseOver(id) {
    setImageSource(id,'_over');
    return true;
}

function doMouseOut(id) {
    setImageSource(id,'');
    return true;
}

function doClick(id) {
    setImageSource(currentContentArea,'');
    return true;
}

function setImageSource(id,state){
    if (document.images) {

        name = id+state;
        document.images[id].src=eval(name+".src");
    }
}