Sign Up form Know How?

[cleck673]

The following is the code to get added to my mailing list.

<form action="http://www.domain.com/cgi-bin/dada/mail.cgi" method=POST>
 <input type="hidden" name="flavor" value="subscribe">
<input type="text" name="email" value="email address" size="16" onfocus="this.value='';return false;"><BR>
<input type="hidden" name="list" value="listname">
<input type="submit" value="Submit">
</form>

What I would like from one of the great hackers is info on how to mine the email address off the sign up form into this field ::::

 <input type="text" name="email" value="email address" size="16" onfocus="this.value='';return false;">

When the user hits submit, the forum is sent to VB database and at the same time to the newsletter database. Then my server will send the 2nd part of the "opt in" process in the form of a "confirmation to subscribe to the list" email.

Can anyone suggest how to do this. Thanks!