popup contact form with validation

[eluser]Mitja[/eluser]
I would like to create popup contact form with validation like i did here http://89.212.111.174/delovtujini.si/ and click "VPIS V BAZO".

You will get popup where you can fill contact form. How can i do this with CI? Here on this example i do everything in the same html page. In CI i try to create new controller for contat form but i dno't know how to open the window. I also try to use http://fancyapps.com/fancybox/. I try but none solution works.

Can someone explain me how to do? Maybe is better to use https://github.com/EllisLab/CodeIgniter/...odeIgniter

Thx