Is it possible to add an Expand all/Collapse all button in WebHelp Output?

Hi there,

We now have > 15 child projects in our merged online help, each containing hundreds of topics. Each child project is a chapter in our WebHelp online help output.

If a user opens a couple of topics in each project, the TOC can become difficult to navigate. Is it possible to add a button that enables users to collapse all of the open chapters / expand all of the closed chapters? We are using RoboHelp 10.

Thanks a lot,

Niamh