Changeing Stylesheets

[ADRIAN]

I have a number of different stylesheets. All have
identical elements (just different colours). I only want
to use one at a time, but
want the system administrator to be able to choose which
one to apply. I thought that I could hard code the pages
to a generic stylesheet and using file.copy VB statements,
overwrite the current file with the new one.
Unfortunately I am getting an unauthorised access error
when I try this during development

Can i get around this (after all, I can perform the task
manually in windows explorer) or any other ideas???

Many Thanks

Adrian