need help for a script to change lots

Hi
plz sombody help me out to code a script or to modify an existing script.. i have a script that ask me to buy or sell when there is no trade opened...what i want is the script to change the lot size if previous closed trade is a lossing one...plz help me out to code this or any suggestions wud be very much apriciated..thnx

Any Kind One To Help Me Out Plzzz???

Any suggestions plz??? hopefuly from some seniors here???