Buy/sell script

I'd need a martingale buy/sell script for mt4. There should be 3 orders. The first is a market order when the script is attached to the chart. The two remaining are limit orders. All orders have the same stop-price. Position size for each order is calculated of %balance and a designated percentage (% of the sum of the 3 orders). I will send you a complete excel spreadsheet and an explaining picture.

-the script should work for € and $ accounts (correct position size calculation)
-I would like to set the %risk and SL distance (1st marketorder to SL) <- does not have to be extern variables; I'd just like to set them easily in the script to save different scripts

It should work with the following brokers: Alpari UK, Armada Markets

Thanks