Can anyone help me out with this tension problem please?

[kdspuhler]

The two blocks in the figure are sliding down the incline. What is the tension in the massless string?
[PLAIN]http://img842.imageshack.us/img842/2586/physicshelp.jpg

Homework Equations

F=ma
That's honestly all I got.

The Attempt at a Solution

Well I realized that the higher block's friction adds to the tension, and the lower block's friction reduces tension. That being said they are equal so I disregarded them and simply tried

2gsin20-gsin20=Ft

 

[fizzynoob]

Sum the forces in X and Y direction and solve for Ft. Its easier if you project the X axis onto the inclined plane.

Lets just Isolate one of the blocks:
[PLAIN]http://img137.imageshack.us/img137/7338/blockeah.png

Can you sum the forces on this block?
what about the other block?