"Black ops server is down" ?!

When I play online it often appears connection interrupted, and then the map goes off. Then it says like:"game lobby closed" and then seconds later it says:"connecting". Then it appears a box whereit says:"Black ops server is down. Try again later or visit: callofduty.com/blackops/status

But then I have waited for a few hours and it says the same and I can't play online again.. 


PLEASE HELP ME!!