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我以下这样做不成功

<script>
function beforesubmit()
{
if (document.form1.sf_content.value=="")
{
alert("内容不能为空！")
form1.sf_content.focus();
return false;
}

 }
</script>

<form id="form1" name="form1" method="POST" action="<%=MM_editAction%>" onsubmit="return beforesubmit()">

<textarea name="sf_content" id="sf_content" style="color:#999;width:500px;height:200px;visibility:hidden;" >请输入内容！</textarea>

<input type="submit" name="button" id="button" value="发表" />

</form>