Flash CS4 ActionScript 3.0 Tutorial
How to Assign a Visibility Property to Button Symbols, Movie Symbols and Text with Flash ActionScript
The visible property sets the object to one of two states, visible and invisible. Since it is a Boolean value, acceptable values are false and true.
Movie Symbol with instance name visMovie_mc
Add a Movie Symbol to the stage.
Select the object and open the Properties panel (Cmd/F3 (PC-Ctrl/F3)). Type in the name visMovie_mc for the Instance Name.
Add a new layer called Actions.
Option double-click (PC - Alt double-click) the keyframe in the Actions layer to open the ActionScript panel.
Copy/Paste the following code to the ActionScript panel.
visMovie_mc.visible = false;
Test your movie by pressing Cmd/Return (PC - Ctrl/Enter). By setting the visible value to false, the object is hidden.