I need help .... 'anybody'

Please help me with my Guest book i cannot acces it anymore the message goes likes this:

/home/jesus/public_html/gbook/lib/mysql.class.php on line 30
[01-Oct-2007 10:27:42] PHP Warning: mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Lost connection to MySQL server during query in /home/jesus/public_html/gbook/lib/mysql.class.php on line 30
[01-Oct-2007 10:42:48] PHP Fatal error: Class 'gbook_sql' not found in /home/jesus/public_html/gbook/lib/vars.class.php on line 10

what will i do?