Need some design advice about complex form and validators

Hi there,
We have a asp.net web form developed in C#. This form has around 100 fields and it's very dynamic form. It's  dynamic in the sense, when you first start you see only about 20 fields,but as you go on making differnt selctions in the forms, panels containging fields are displayed or hidden. Almost each field is validated on the client side using .net validators. Javascript is used to turn on/off validators depending on if the panel they are in is visiable or not.
This form has some bugs and it's pain in the rear to debug this form because almos every field has at least 2 validators - require and/regular experssion. Also some of the fields when selected do autopostback. most often users cannot submit the form because one/more validators are still enable but the fields that they are attached to are invisible so it's hard to debug as which validtor is causing the problem.
So here my design question. 
What is the easier way ...