Where is the drive belt tentioner

[spc2125]

Im trying to remove my drive belt but I cant find which bolt to loosen?

I took off the engine mount. So where is this bolt located? and is it a bolt that I have to take off or is it like a square hole that I put a socket wrench into??
And what size is it?

Thanks!!

[spc2125]

Found it!

http://www.justanswer.com/uploads/ebrock63/2009-05-31_171744_2009-05-31_111925.png