submit form with ajax - validation

[eluser]Schumacher[/eluser]
Hallo fellow Developers.

I am making a site where i've made a jquery.ui popup to write a message to a user, there are a title and a message field.

which way are you validation the input? Is it posible to use the form_validation in the method the ajax is calling ? or in which smart way can i do the validation of the form without having to repeat myself twice and get messy code ?

- Schumacher