The swf file is still on my site working fine. And another illustration. Assume the prices appeared in the next 4 hours based on historical data are normally distributed. And the next 4 hours bar tall on average is 30 pips, the the movement range is 30pips. To calculate the offset, we can sum up, in a long period time of historical data, the ups and downs in that time frame, movement toward to the side we going to buy is positive, and movements toward to the losing side is negative. Then if the summation is positive we know there is a tendency the market move to the winning side, vice versa. And divide the summation with number ups and downs or bars we used for summation. Then we have an average tendency, that is the offset.