Change the redirect page after logging in

I just uploaded wordpress 2.8.5 and I am using it with P2 theme.

I am wanting my users to have to login first, so I have my webpage directed to wp-login.

this works fine but I want to change the page that the login takes you to. Right now when you hit submit it takes you to wp-admin. I want it to take you to a different page.

Any help would be greatly appreciated!

Thanks!