[wellylug] How to get rid of annoying PHP error message?

[Damon Lynch]

Hi,

I'm getting this at the bottom of every squirrelmail page, apart from
login and logoff:

"Warning: Unknown(): Your script possibly relies on a session
side-effect which existed until PHP 4.2.3. Please be advised that the
session extension does not consider global variables as a source of
data, unless register_globals is enabled. You can disable this
functionality and this warning by setting session.bug_compat_42 or
session.bug_compat_warn to off, respectively. in Unknown on line 0"

What does that mean in plain English?  I'm running squirrelmail 1.2.11,
on PHP 4.3.1.

Thanks.

Best wishes,
Damon