function imagechange(whichimg,newurl) {
        var v = navigator.appVersion.substring(0,1);
        if (v=="2") return;
        for (var i = 0; i < document.images.length; i++) {
            if (document.images[i].name == whichimg) {
                document.images[i].src = newurl;
            }
        }
    }

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