button states in a button symbol's Timeline. 5 How can you change the opacity of a color or instance in Flash Review Answers 1 A symbol is a graphic, button, or movie clip that you create once in Flash and can then reuse throughout your document or in other documents. An instance is a copy of a symbol located on the Stage or nested inside another symbol. 2 You can import an asset file to the library, which adds the asset only to the Library panel. You can also import an asset file to the Stage, which places the asset on the Stage and automatically adds the asset to the Library panel. 3 When you import layers in an Illustrator file as layers, Flash recognizes the layers in the Illustrator document and adds them as separate layers in the Timeline. When you import layers as keyframes, Flash adds each Illustrator layer to a separate frame in the Timeline, and creates keyframes for them. 4 Button symbols include four states: Up, Over, Down, and Hit. * Up is the default state for the button. * Over determines the button's appearance when the mouse rolls over it. * Down determines the button's appearance when it is clicked. * Hit defines the active area, which is the area that responds to the mouse click. 5 The opacity (or transparency) of a color or instance is determined by its alpha value. To change the opacity of a color, change the alpha value in the Color Picker. To change the opacity for an instance, select Alpha from the Color menu in the Property inspector, and then change the alpha percentage.   4. Working with Text Text-dynamic or static-can play a critical role in a Flash movie. You can animate it easily using a simple mask, apply a filter to create a special effect, or use it to provide the viewer with essential information. Lesson Overview In this lesson, you'll learn how to do the following: * Create text in Flash * Format text * Convert text fields to symbols * Use masks to animate text * Organize layers in a Timeline * Work with layer folders * Copy objects from one layer to another * Apply filters to text * Use tweening to animate objects quickly This lesson will take approximately 90 minutes to complete. If needed, remove the previous lesson folder from your hard drive, and copy the Lesson04 folder onto it.   Getting Started You'll start the lesson by viewing the animated birthday card that you'll create as you learn to work with text in Flash. 1. Double-click the 04End.swf file in the Lesson04/04End folder to play the animation.