Problem Searching

I would have searched to see if this had been posted before… but the problem I’m getting is with the search feature. Everytime I try to search it gives me:

Fatal error: Allowed memory size of 8388608 bytes exhausted at (null):0 (tried to allocate 129 bytes) in /home/virtual/site284/fst/var/www/html/forums/search.php on line 810

Fatal error: Allowed memory size of 8388608 bytes exhausted at (null):0 (tried to allocate 45 bytes) in /home/virtual/site284/fst/var/www/html/forums/includes/functions.php on line 467