move the <Enter> focus between 2 buttons

From: Rocio (rocio.katsanis_at_softwareservices.net)
Date: 05/20/04 

Date: 20 May 2004 13:49:31 -0700

I have a aspx page, with 2 controls (ascx).

Control1 contains a SEARCH button, and textbox to enter the string to
search for.
Control 2 contains a LOGIN button, and 2 text boxes to enter the
username & password to login.
Any user can perform a search, but if he applies for an account, he
can login and performed an enhanced search.

Currently, the SEARCH button responds when the user clicks <Enter>,
which works find if he is doing a search.

But if he has an account and enters his username & passowrd and
presses <Enter> the command goes to the SEARCH button, this case doing
nothing since he did not enter anything to search for.

How can I switch the focus of the <Enter> from SEARCH to LOGIN buttons
in the same page? I'm figuring, when the user focuses in the
txtUserName for example, I would like to change the focus from the
SEARCH button to the LOGIN when he presses <Enter>.

Is this possible? Anyone knows how?

TX! in advance!