Go back to KDE3

[Luca]

Hi all.

I installed KDE4 some days ago and tryed it for some days. This will
be a great! But for now I find it a little unstable...

I don't wanna uninstall it, but only go back to KD3 as default session type.

During installation a character based interface asked me what KDE use
as default. I choosen KDE4 but now I don't know how to lauch again it
to change my choice!

Can you help?

-- 
-- luca