Finding the Third Force to Achieve Zero Total Torque on an Equilateral Triangle

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http://img300.imageshack.us/img300/4792/physics1gj9.th.png

"Two forces [tex]F_1[/tex] and [tex]F_2[/tex] act along the two sides of an equilateral triangle as shown...Point O is the intersection of the altitudes of the triangle. Find a third force [tex]F_3[/tex] to be applied at B and along BC that will make the total torque zero about the point O."

So the sum of the torques = 0. I don't know what to do first. Should I put the forces into component form and take the tangential component of the forces??
 
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merced said:
Click on the image.

I don't have anything to click on, it's my computer, probably. Someone else will be able to give an exact reply to you. In the meantime, prepare some work to present.
 
I guess what I mean is, how do I determine what is perpendicular to the intersection (O)? Because I have to use the perpendicular force right?