Can anyone help me out with this tension problem please?

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The discussion revolves around calculating the tension in a massless string connecting two blocks sliding down an incline. Participants note that the friction on the higher block increases tension while the friction on the lower block decreases it, leading to a net effect that can be disregarded for simplification. The approach involves using the equation F=ma and summing forces in both X and Y directions, particularly projecting the X axis onto the incline for clarity. A suggestion is made to isolate one block to analyze the forces acting on it. The conversation emphasizes the importance of carefully considering the forces on both blocks to find the correct tension value.
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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
 
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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?
 
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