How to switch default browser

How would one go about switching the default browser?  I remember at
one point switching from the standard Squeak browser to the
Refactoring Browser, but since found out that OmniBrowser is the
Squeak browser of choice (if I'm wrong about this please let me know)
but can't figure out how to switch the default to OmniBrowser.  I know
I have it installed and can open it manually from the workspace, but
it would be nice if I could switch the default.  Thanks everybody.

-Rich