Navigate from one slide to the next using Flash

Hello everyone!

I think this has been covered recently, but I can't find the thread anywhere.

I need to lock the navigation in a slide to make sure the user watches the swf and takes on the activity, and then for the learner to click on a "Next" sort of button that it'll move the presentation forward to the next slide.

I know there is a bit of coding that can be added to the Flash movie to make that happen, but can't find it anywhere.

Any help would be much appreciated!

All the best,

Paco.