Error: Can't connect to MySQL host!

Can't connect to database db1214_revtech!

Warning: mysql_query() [function.mysql-query]: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /nfs/c01/h09/mnt/1214/domains/revolutiontech.com.au/html/click.php on line 13

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /nfs/c01/h09/mnt/1214/domains/revolutiontech.com.au/html/click.php on line 13
Couldn't redirect: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)