Nagios toolbar

Hi

I’ve just installed nagios on Solaris 10 and all is working fine except for the left hand menu. When I click on one of them I get the following error:

Not Found

The requested URL /nagios/cgi-bin/tac.cgi was not found on this server.

As soon as I create and copy the cgi files to there, the brozer wants to download the file. Any ideas as to why I cannot go into one of the links?