Can Someone help me with this PHP error

[eluser]Ben Lester[/eluser]
when i am trying to delete a forum post it come up with this error message
Fatal error: Call to a member function query() on a non-object in /home/blitzcit/public_html/forums.php on line 607

I attached a file of the forum.php kindly help me what is wrong in this script

Thanks in advance..