mysql_connect Database Errors

[Chalex4]

Ever since I upgraded to vbulletin 4, my forum constantly seems to be getting database errors along the lines of this (I've got 1000 emails just today):

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: User xxxxxx_forum already has more than 'max_user_connections' active connections
/home/xxxxxx/public_html/includes/class_core.php on line 312

MySQL Error   : 
Error Number  : 
Request Date  : Tuesday, June 1st 2010 @ 11:38:05 AM
Error Date    : Tuesday, June 1st 2010 @ 11:38:05 AM
Script        : http://www.atkcommunity.com/threads/clientscript/build/shadowbox.js
Referrer      : 
IP Address    : 216.104.15.130
Username      : 
Classname     : vB_Database
MySQL Version :

The script line changes in virtually every email I get to something else (probably dependent on what the person was trying to view?). However, could this be caused by my .htaccess rewrites? All the scripts begin with "http://www.atkcommunity.com/threads/".

Website: www.atkcommunity.com

Thanks in advance.