<csactionparam>

This tag is used to identify and control the user interactive components of the Inspector or Actions palette that comes up when a given action is chosen. By inserting the appropriate parameter type, you can add input boxes, pull-down menus, browse buttons, etc. into your Inspector or Actions palette, and pass values entered in these fields to your JavaScript code for processing. The <csactionparam> tag is optional and can be omitted where no user input is needed for an action. Adobe GoLive 4.0 and later ship with a number of different parameter types.

Creating Actions > Creating your own actions > <csactionparam>