function changeLayeredImage(layer,imgName,imgObj) {
        if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
        else document.images[imgName].src = eval(imgObj+".src");
}

function changeImage(imgName,imgObj) {
        document.images[imgName].src = eval(imgObj+".src");
}


function preload(imgObj,imgSrc) {
        if (document.images) {
                eval(imgObj+' = new Image()')
                eval(imgObj+'.src = "'+imgSrc+'"')
        }
}