Javascript> Check for specific email address

<script>
//function to check for a specific email address
function donotreply()
{
if (document.forms["reply"]["send_to"].value == 'do-not-reply@example.com')
{
alert('You would try to send to the one address yer not allowed to....try again!');
return false;
}
return true;
}
</script>

And the form entries…

<form name="reply" onsubmit="return donotreply()">
<input type="text" name="send_to">