Using the ScriptClip
To use the ScriptClip we simply drop it onto the Timeline that we want to affect. Let’s look at the current Timeline of clip.bird.

The Timeline consists of two Layers (top and bottom), each with a single key frame What I usually do is add an additional Layer to place the ScriptClip on the Timeline. In this case, I’ve added a new Layer and called it script.

Having created the new Layer, place an Instance of the ScriptClip on the Stage of the clip.bird Symbol. I usually center the ScriptClip on the Stage so that the selection box of the Instance reflects the scale of the image content. Keep in mind the script that exists in two key frames inside the ScriptClip addresses or affects the parent Timeline that the Instance of the ScriptClip is placed on.
The final step is to place an Instance of clip.bird, now including the ScriptClip within it, onto a Timeline. In this case, place it on the main Timeline (or the main Stage). When you place it on a Timeline, the alpha property defaults to 100%. Because the ScriptClip increments the current alpha value, its important that you reduce the alpha value appropriately when you place the Instance on a Timeline. In this case, I’ve placed the Instance of clip.bird in the center of the Stage and using the Effect Panel, reduced the alpha property to 0%, making the Instance completely invisible. When the swf is previewed [CTRL-ENTER], the Instance fades into view. View x0001.swf to see the ScriptClip function.
By changing the value of the increment, you can modify the fade-in effect. View x0002.swf to view the effect with an increment value of 1. View x0003.swf to view the effect with an increment value of 10.
You can load the demo file, scriptclip.fla, into Flash and modify the increment value yourself. Note how smooth the Instance fades in, particularly with fast fades.