Mailing list signup

Hi,

I am a real novice at this but have recently had to move a web site from where it was hosted to my own virtual hosting package running cpanel. The original site had a mailing list signup using (I think) a php script and this form:

<h2>Join the Mailing List</h2>
<form action="riomhphost.php" method="post" name="mailForm" id="mailForm" onsubmit="MM_validateForm('email','','RisEmail');return document.MM_returnValue">
<p>
<label for="email" class="field">Your Email:</label>

<input name="email" type="text" class="textline" id="email" maxlength="100" />
</p>
<p class="indent"><input class="button" type="submit" name="Submit" value="Submit" /></p>
</form>

I have migrated all the addresses to a new mailman list and it's all set up, I just need to know how to get the form subscribing from the website again. I assume I need a script, does anyone have a template?