FORMAIL EPOST

Hej,
Har ett formulärfält enl nedan som jag skulle vilja kolla så att den som fyller i sin epostadress verkligen fyller i en gällande adress. Hurgörs detta??

<form action="http://formmail.xxxx.net" method="post" onsubmit="return(form_validator(this));" form name="form">
<script type="text/javascript"><!-- //script hider
function form_validator(form) {
if(form.email.value == "") {
alert("Din epostadress saknas!");
form.email.focus();
return(false);
}
return (true);
}
// end script hiding -->
</script>
<table border=0>
<!--DWLayoutTable-->
<tr>
<td width="392" height="44" valign="top"> <p>
<input type=hidden name=userid value=>
<input type="hidden" name="recipient" value="info@xxxx.net">
<input type="hidden" name="redirect" value="http://www.xxxx.net/nyhetsbrev.php">
<font face="Verdana, Arial, Helvetica, sans-serif" size="-2">Nyhetsbrev?
Fyll i din epost nedan<br>
</font><font size=1 face=arial>
<input type="text" name="email" size="25" maxlength="40">
<input type=submit value=" OK " name="Nyhetsbrev">
</font></p></td>
</tr>
</table>
</form>

Hej!

<script type="text/javascript">

function form_validator(obj){
    return /^[\w!#\$%&'\*\+\-\/=\?\^`\|\{\}~]+(\.[\w!#\$%&'\*\+\-\/=\?\^`\|\{\}~]+)*@([\w!#\$%&'\*\+\-\/=\?\^`\|\{\}~]+\.)+[a-z]{2,4}$/i.test(obj.elements["email"].value);
}

</script>

<form onsubmit="return form_validator(this)"...

:)

OK, Tackar..