See the JavaScript API documentation.

Where do I put the JavaScript?

1. Put the Javascript source code file in the same folder with your GUI file.
2. Attach the JS file to your GUI file by : Edit → Project Properties → Script Manager → Add Script → Browse and select the JS file
3. Attach the JS to your button via “Button Properties”. For more info http://www.commandfusion.com/docs/scripting/startup.html

Click here to search our Google Groups for JavaScript.