使用js控制iframe中的各元素

<script type="text/javascript">
var form=document.getElementById("loginForm");
if (form.username.value=="")
{ alert("请填写会员名");
form.username.focus();

}
if (form.password.value=="")
{ alert("请填写密码");
form.password.focus();

}
</script>
<iframe src="../../bbs_login.aspx" border="0" height="0" width="0" style="visibility: hidden"></iframe>

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