<form method="POST" action="http://email-acsacs.co.uk/interface/list.php">
<input type="hidden" name="accName" value="ACS"/>
<input type="hidden" name="listName" value="Subscribed Customers"/>
<input type="hidden" name="doubleOptin" value="false"/>
<input type="hidden" name="successUrl" value="NO-REDIRECT"/>
<input type="hidden" name="errorUrl" value=""/>
email: <input type="email" name="email"/>
<br/>
<input type="submit" value="Subscribe" />
</form>