POPUP PRO not working with html form in it. (no shortcode used)

Hi!

I've inserted this as my HTML code for the form:

"<form name="feedblitz" id="feedblitz" method="POST" action="http://www.feedblitz.com/f/f.fbz?Track"><p style="text-align:center;">Your email address:
<input name="EMAIL" maxlength="255" type="text" size="20" value="">
<input name="FEEDID" type="hidden" value="http://thefinanser.co.uk/fsclub/atom.xml"><input name="PUBLISHER" type="hidden" value="2257211"><input type="submit" value="Get email updates">
Powered by FeedBlitz</p></form>"

It is for Feedblitz for my client to allow people to subscribe to his rss feed. Anyhow, it doesn't work. The same code is in the sidebar and works perfectly, but when added to the popup, the popup just stays and doesn't do anything when you click on the get email updates button...

Can someone please help me with this?

I've read a bit of other peoples problems on here and one thing i saw was to try with page footer in the settings, but that didn't solve my issue. Thank you!