function netscapeKeyPress(e) {
     if (e.which == 13)
     document.feedback.submit = true;
}

function microsoftKeyPress() {
    if (window.event.keyCode == 13)
    document.feedback.submit = true;
}

if (navigator.appName == 'Netscape') {
    window.captureEvents(Event.KEYPRESS);
    window.onKeyPress = netscapeKeyPress;
}