Need help with javascript and frames

[hijaker]

Hi guys

I need help with this :

I have a 2 frames page : on thr top frame i want to load a page of mine and on the bottom frame i want to load an external page ( from other domain )

Is there a way that i can fill a form on the second page , the external page, from the top frame?
Like :

I have a button on the top frame, and when i click that button i fill some form fields in the second frame ( like login/password )

Any help is appreciated, i know there are some javascript gurus around here , eheheh

Thanks !