Немного конктретики:
Основная ошибка: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) at /var/www/cafemam/data/www/cafemam.ru/htdocs/_lib/functions.php line 126
Где: /var/www/cafemam/data/www/cafemam.ru/htdocs/_lib/functions.php line 126
Что: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
В чем: mysql_connect()