errors with php site

Hi, Some problems with the PHP site today - see below. Perhaps not enough connections allowed to MySQL db? Cheers Laura --------------------------errors start here ------ Warning: MySQL Connection Failed: Can't create a new thread (errno 11). If you are not out of available memory, you can consult the manual for a possible OS-dependent bug in shared-manual.inc on line 8 Warning: Supplied argument is not a valid MySQL-Link resource in shared-manual.inc on line 10 Warning: Cannot add header information - headers already sent by (output started at shared-manual.inc:8) in shared-manual.inc on line 18 Warning: Cannot add header information - headers already sent by (output started at shared-manual.inc:8) in shared.inc on line 320 Warning: Cannot add header information - headers already sent by (output started at shared-manual.inc:8) in shared.inc on line 324 ----------------------end errors-------------------