Passing arguments to a script from a browser

[Moe]

I am a web developer and I am working with a filemaker developer. He has made a filemaker database that uses scripts to edit records.

For example: in Filemaker you create a new record, and then you enter some text in into a field and click a button. The button triggers a script that takes an argument from a field and performs some queries, calculations, etc.

My problem is this: I have to make this thing work on the web. It's easy enough to run the scripts that he has written, but these scripts are supposed to take an argument and there doesn't seem to be any way to pass an argument from the web. Any suggestions?