My site has been hacked by Killermind? anyone knows about this?

October 9, 2011 6:54pm CST
My site has been hacked. I dont know how? when? but when I go to my site the background colour is black and is writeen as Pwned by killermind and sth patel! But amazingly sometimes the site opens. Does any one know about killermind? are there any ways how i can get rid of it?? HELP!
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