function setHomePage (elem) {
    var url = document.location.toString ();
    if (url.indexOf ('?') != -1) url = url.substr (0, url.indexOf ('?'));
    elem.style.behavior='url(#default#homepage)';
    elem.setHomePage(url);
}

function validateEmpty (id) {
    return document.getElementById(id).value.length > 0;
}