Ok, I believe I found out what was going on! Uff... So... I was using multibox 2.0.2. Trying to debug what was going on I thought about something really simple. multibox works with lots of content, one being html elements. So I can use a div on my page and tell multibox that's what I want to see on the popup box. Now it's obvious but I couldn't think of it before: multibox creates a copy of that div to show it as a popup. So long elements' ids...
Now this leaves me with two alternatives: - popup with an iframe (works just right but isn't good to submit forms, everything needs to be ajaxified) - forget popups whenever I need to submit a form without ajax Well, thank you both for your precious time, I believe I learned something new today so it wasn't in vain!
