The URL bar is hidden on load when running on the iPhone. It will do nothing on other browsers. The code:

<script type="application/x-javascript">

if (navigator.userAgent.indexOf('iPhone') != -1) {
        addEventListener("load", function() {
                setTimeout(hideURLbar, 0);
        }, false);
}

function hideURLbar() {
        window.scrollTo(0, 1);
}

</script>