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pivot point Calculation Method

please let me knw the method for Calculating Pivot Point
I have some pivot Point but not getting the Actual Calculation Method.. if any1 have the Method of this Calculation.. please let me knw..

Click link to access uploaded file:
C:\Documents and Settings\jaan\Desktop\Pivot(1).xls
If the price is above the PP, then one would only be long.This Pivot Point Calculator can be used to calculate pivot points for forex, futures, bonds, commodities, stocks, options and any other financially traded instrument The equations are as follows:

R2 = P + (H - L) = P + (R1 - S1)
R1 = (P x 2) - L
P = (H + L + C) / 3
S1 = (P x 2) - H
S2 = P - (H - L) = P - (R1 - S1)