"elbow" <myothercarisshittoo@posh.com> wrote ...
> Is there any easy way to have a mac and a pc sharing the same internet 
> connection?

Probably.  I very nearly* shared an internet connection between a 
Linux running computer and one running Windows 2000.  I can't imagine
a Mac could be much harder.
 
> Im all pc so I have no idea how to help my poor frail mother sort this 
> one out.

I've forgotten all the details by now - Google 
   Mac "Windows XP" internet sharing
or similar for a start.

* Windows XP would have probably had a better shot.