我的javascript代码到底在哪出问题了？？？（新手求救） - 编程论坛

<title>无标题文档</title>
<script language="javascript"id="clientEventHandlersJS">
    function document_onmousemove()
    {
        form1.txtMousePosition.value=window.event.clientX+","+window.event.clientY;
    }
</script>
<script language="javascript" for="document" event="onmousemove">
    return document_onmousemove();
</script>
</head>

<body>
    <form id="form1">
        <p><input type="text" value="" name="txtMousePosition" size="20"/></p>
    </form>
</body>