Closing a window or frame in amenu application

Sir,
I am at present doing a project in java swing regarding preventive healthcare systems. I would like to let you know a problem i am confrontin now. The problem with my aplication is :
It is a menu driven application (The previous application was in VB). When I select an item in the menu, i get a new JFrame with applications like --- add member,registration etc. I have an OK button in each of these frames.
The problem is that when i click the OK button, the whole application is exitted , as i have given System.exit(0) in the ActionListener of the OK button. What I want is "only that particular frame has to go and the main form(with the menu on it) should stay on."
Please suggest a solution for this and please reply to me.
Thanking You,
Yours sincerely,
Ann Baby.

In the ones you don't want to exit, put
frame.hide();
or
frame.setVisible(false);
instead of System.exit(0);

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