[ILUG] SU, modified paths..

[Donncha O Caoimh]

When using su on a Redhat box I notice that when I su to root, the root
$PATH isn't setup. I aliased su to "su -l" which makes the new shell a
login, but that changes dir to the home dir of the user I'm "su"ing to. 

Can anyone point me in the right direction to get su working properly?
All shells use bash and nothing strange lives on the boxes or anything
besides a few extra aliases added to files in /etc/

Donncha.