Hi Pagetta
As Dr Tandem said, Availcheck (
http://www.availcheck.com ) is a handy free calendar and is also very user-friendly, so your customer can update the calendar themselves.
My customer at
http://www.villatorentflorida.com/index.shtml has a working example available at
http://www.availcheck.com/cgi-bin/ca...&showyear=2006
Hope this helps.