function launch(file, name, winwidth, winheight) {
    var string = "width=" + winwidth + ",height=" + winheight + "toolbar=no,directories=no,menubar=no,resizable=yes,dependent=yes";
    hwnd = window.open(file, name, string);
    if (navigator.appName == "Netscape") {
        hwnd.focus();
    }
}