function openRequestForm() {
    // show request form in popup
    var width = 525;
    var height = 700;
    var url = 'http://www.startsampling.com/sm/100508';

    var leftVal = (screen.width - width) / 2;
    var topVal = (screen.height - height) / 2;

    var args = 'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0';

    var wRequest = window.open(url, "Request", "height=" + height + ",width=" + width + ",left=" + leftVal + ",top=" + topVal + args);
    if (wRequest != null) {
        wRequest.focus();
    }
}