iframe的值为什么获取不了呢?请高手帮忙呀.

<IFRAME id=Editor

style="WIDTH: 100%; HEIGHT: 150px; BACKGROUND-COLOR: white" marginWidth=1

src="about:blank"></IFRAME>

<input type="hidden" name="Contents" id="Contents" value=">

<input type="submit" name="Submit" value="提交" onsubmit="putValue()">

<SCRIPT>

function putValue(){

document.getElementById(Contents).value=window.Editor.getHTML();;

}

</script>

<%@ contentType="text/html;charset=GB2312" %>

<%

String Contents=new String(request.getParameter("Contents").getBytes("ISO-8859-1"));

out.println(Contents);

%>

[559 byte] By [msdn] at [2007-9-21 9:34:13]