Excel based back-testing formulas

Hello,
I want to test a strategy of buying 20day Highs and 52 weeks highs..
I know how to grab the H L O C from yahoo.

I need help in the formulas on calculating 20 days high and 52 week H/L
and i dont know how to write the formula to buy and sell

Preferable i like buy when it exceed either 20 day or 52 week high and sell at a 4% profit or sell when its 2% loss.

any ideas

Thanks in advance
 
Financially, you're better off not being able to test such a strategy lest you are tempted to engage in it.
 
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