Rename Function

[Deftone]

Hi,

I just setup my new server en installen PhP5, MySql5 and Apache2.
Now I get problems while renaming files. I'm using script to shutdown my site while I'm working on it. When I hit the button Shut Down I get an error telling me this:

Warning: rename(/home/site/public_html/old_werkzaamheden.php,/home/site/public_html/werkzaamheden.php) [function.rename]: Permission denied in /home/site/domains/kimi-raikkonen.nl/public_html/site/offline.php on line 13

Line 13 is:
{ rename("/home/site/public_html/old_werkzaamheden.php", "/home/site/public_html/werkzaamheden.php");

Also some of my gallerys are using rename function.
Shoud I turn sommething on in php?

Thanx