function btn_click(btnID) {
    //var btn = document.getElementsByName(btnID);
    var btn = document.getElementById(btnID);
    if (btn) btn.click();
}
function external_link(URL) {
    pageTracker._trackPageview('/ExternalLink/' + URL);
    window.open(URL, 'buyNow', 'toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,copyhistory=yes,resizable=yes') 
}
function goto_url(URL) {
    window.location = URL;
}
function open_url_new_window(URL) {
    window.open(URL, 'buyNow', 'toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,copyhistory=yes,resizable=yes') 
}