How to make the Edit User Profile to have all tabs in one page? If I load this page
http://domain.com/user/1/edit

I have on top more tabs that I have to unify into one page

I've added some custom fields to the user profile that adds some more tabs when I go into 

http://domain.com/admin/user/profile

so that adds the tabs that I need to appear in the same page as http://domain.com/user/1/edit

how can I do that?

note that I'm using Drupal 6.19
The One page profile module should do this if you're using the core Profile module.