【转】两个输入框同步输入

<script language=javascript>
    function gbcount(message) {
        if (message != "") {
            document.all("ssss").value = message + "@qq.com";
        }
        else
            document.all("ssss").value = "";
    }
</script>
<form>
<textarea class=cnone name="contents" onmousedown="this.className='cdown'" 
onmouseover="this.className='cup'" onmouseout="this.className='cnone'" onkeydown=gbcount(this.form.contents.value); onkeyup=gbcount(this.form.contents.value); 
cols="80" rows="8" wrap="VIRTUAL" id="contents">
</textarea>
<input name="ssss" type="text" id="ssss">
</form>