try this:
Code:
<form action="news.php" name="subscribeform" method="post">
<input type="hidden" name="subscribe_lng" value="{$store_language}" />
<input type="text" name="newsemail" size="19" />
<a href="javascript: document.subscribeform.submit();" js_to_href="Y">Subscribe</a>
</form>
This is the most basic of subscribe forms.
You will want to modify it to make it pretty.
This is basically ripped out of news.tpl
Check it out for yourself.