[/B]hello guyz .. !!

i came across this interesting problem and have been trying to figure this out since... here it goes..

We are given 8 similar balls. 7 of them are identical in weight and 1 is defective. This one defective ball can be either heavy or light. We are given a weighing balance which we can use **only two times** to find out the defective ball. Find the defective ball.

I could only come up with a solution where I had to use the weighing balance 3 times. Can anyone solve it in 2 balances.

Any ideas ?