右键弹出新窗口(JavaScript)

<script language = JavaScript>
<!--
    function click()
    {
        if (event.button == 2)
        {
            window.open("pop.htm","popwindow",
            "toolbar=no,menubar=no,width=200,height=200");
        }
        document.onmousedown = click;
    }
//-->
</script>