function openWindow(url, windowName) {
    newWindow = window.open(url, windowName, 'menubar=no, toolbar=no, location=no, scrollbars=yes, resizable=yes, status=no, width=640, height=500');
}
function openRegistrationWindow(url, windowName) {
    newWindow = window.open(url, windowName, 'menubar=no, toolbar=no, location=no, scrollbars=yes, resizable=yes, status=no, width=800, height=600');
}
function areYouSure(message) {
    return confirm("" + message);
}