MySQL Error: 1046 (No Database Selected)

[Dusan Djordjevic]

I am trying to install Imp 2.2.6 with Horde 1.2.6 on Red Hat Linux 7.1 with 
Mysql 3.23.43 and Apache 1.3.22. I followed the instructions, installed 
phplib and horde. I also created necessary tables in mysql database using 
supplied script. /horde/test.php3 says everything is ok, but when i click on: 
'Click here to test PHPLIB for Horde' i get message:

Database error: cannot use database 
MySQL Error: 1046 (No Database Selected)
Session halted.

I tried with docs/faq but it didn't worked. Any ideas ? 
Thanks in advance...
-- 
Dusan Djordjevic, system administrator
Tradal Ltd, Cypriot Branch - http://www.tradal.net