<script language=javascript>

<!--

function check()

{

if(document.form.name.value=="")

{alert("名字不能为空");return false}

if(document.form.content.value=="")

{alert("内容不能为空");return false}

var email = document.form.mail.value;

if(!/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/.test(email))

{alert("邮箱不正确");return false}

}

-->

</script>

<form id="form" name="form" method="post" onSubmit="return check()">

<input name="name" type="text" size="30" />

<input name="mail" type="text" size="30" />

<textarea name="content" cols="41" rows="11" /></textarea>

</form>