Form Validation using Custom Thread Fields

[RateU]

I've tried creating a simple form "wizard", using conditional (Template Conditional or PHP In Template plugin). But it is not a Javascript form :

http://www.14.mynie.co.cc/newthread.php?fid=49

The form "system" is something like this (I hope):
   
It is a bit hard to explain it, so, I "draw" it.

Maybe it is a very bad form wizard, breakable with direct URL