how to handle Multiple form on one page without showing validation errors of both forms.

[eluser]pankaj[/eluser]
I want to put two forms on my front page which are one for "registration of user" and one for "login" like facebook has on its front page but when I submit the page either for registration or login it will show validation errors for both forms can anybody please explain me how to handle both forms at a time without showing errors from both forms. and it should show error for particular form only and not for both forms.
is there any thread on this topic as I can't find one.

please help
thank you.