Results from child modal window not populating the parent window

hi,
 
I HAVE PECULIAR PROBLEM IN MY websphere - struts APPLICATION.

i HAVA A MAIN PAGE WITH A BUTTON. WHEN I CLICK ON BUTTON A MODAL WINDOW IS OPENED. i NEED TO FEED THE DATA AND SUBMIT IT. As soon as i click submit the main page is again opening in new window.

Please suggest how to avoid opening new window and also I want to refresh the main page with new results.

It is really urgent. iF POSSIBLE PUT THE COMPLETE CODE

Advance Thanks