Amibroker system simple trading modification

This is a very small modification project. I have had help writing a stock market trading system (150-200 lines) written in Amibroker which I would like now to be modified. The code contains several parameters. I would like some parameters replaced with others which I can provide. These are Amibroker defined. The main part of this job is that I would also like the index filter - (Period = Param("Index Filter MA Period",10,1,1000,1), to be replaced by one which works on a crossover of 2 results from an indicator that I have the code for - AND then for this to be called into the Buy argument if the Index filter is switched on in the parameter box. Basically this job is pretty much a cut out and replace with a few lines of code (provided) job - so that the system coding still functions as before. Payment will be made once the parameters have been tested. And any successful freelancer who carries this out can be expected to be used for further modifications in the future. (Files to be provided upon acceptance)