Thanks for your help Dark,
For you information:
I'm using Xfree86 4.5.0 (installed myself which was probably a mistake, but as I am the only one using this particular server I decided the best way to learn was to try.) I am also using tightvnc 1.2.9-1.
As it seems to be working, I'll leave it alone, I've got the thread bookmarked incase of future problems though.
Cheers
K