Problem with Firefly's hacks

I can never seem to install them Like on the attachment viewer. I thought your supposed to upload it and there's installation instuctions from there. But on all of his hacks I get this error:

Fatal error: Call to undefined function: cpheader() in /usr/local/plesk/apache/vhosts/ps2storm.com/httpdocs/install_attachviewer.php on line 5

And i'm not sure on what to do :stupid:

[FWC]

You have to run that file from your admin directory. It looks like your have it in your web root.

[Lucky]

yep!

[Ajay]

Ok, now it works