function onWhois() {
    var dn = document.getElementById('domain_name').value;
    if(dn.length) {
        var req = "/services/whois/exec.html?action=whois_domain&domain_name="+document.getElementById('domain_name').value+"&domain_zone="+document.getElementById('domain_zone').value;
        whois = window.open( req, "whois", "scrollbars=1, width=460, height=500" );
    }
    return true;
}