Well why is the inc_reviews.php file in your classifieds directory? is that the directory for reviewpost?
However given those errors what I would recheck is the instructions on including this module on this forum we have posted.
Check the config-intr.php file and make sure your prefix for reviewpost is included and make sure if reviewpost and vbulletin are in separate databases you have uncommented the $link and mysql_select_db lines and filled in the proper variables.
The error above tells me specifically mysql is not even open which definately means you need to fill in the $link and select database lines and uncomment them