mySQL query error: DELETE FROM acss_sessions WHERE running_time < 1283488003 or ip_address='38.107.191.98'

mySQL error: Table 'acss_sessions' is marked as crashed and should be repaired
mySQL error code: 
Date: Friday 03rd of September 2010 07:56:43 PM<center>Could not connect to mysql server. <a href='http://www.hosted-forum.com/contact.php'>Please contact Support</a></center><p>