function open_window(url, name, w, h) {
popupWin = window.open(url, name, 'resizable=0,scrollbars=0,width=' + w + ',height=' + h + '');
// focus window (only for Navigator >= 3.0)
if ( (navigator.appName != "Microsoft Internet Explorer") && (navigator.appVersion.substring(0,1) == "3") )
popupWin.focus();
}