禁止鼠标右键

<script type="text/javascript">

    if (window.Event)
    document.captureEvents(Event.MOUSEUP);
    function nocontextmenu()
    {
    event.cancelBubble = true
    event.returnValue = false;

    return false;
    }
    function norightclick(e)
    {
    if (window.Event)
    {
    if (e.which == 2 || e.which == 3)
    return false;
    }
    else
    if (event.button == 2 || event.button == 3)
    {
    event.cancelBubble = true
    event.returnValue = false;
    return false;
    }
}
document.oncontextmenu = nocontextmenu; //对ie5.0以上
document.onmousedown = norightclick; //对其它浏览器
</script>