var nav = window.Event ? true : false;

if(nav){
    // if netscape
    window.captureEvents(Event.KEYDOWN);
    window.onkeydown = NetscapeEventHandler_KeyDown;
    
}
else{
    // if other
    document.onkeydown = MicrosoftEventHandler_KeyDown;
    
}

// stop Enter
function NetscapeEventHandler_KeyDown(e) {
   
    if (e.which == 13) {
        return false;
    }
    return true;
}

// stop Enter
function MicrosoftEventHandler_KeyDown() {
   
   
    if ((event.keyCode == 13))
    {
        return false;
    }
    return true;
}