Add Motion Guide Layer
Flash CS3 Tutorial
How to Create a Motion Path on a Separate Flash Layer
Motion guides are used to define the path of an animated object. The path resides on a separate layer and is generally drawn with the Pen tool.
You can also use the Line tool or Pencil tool to draw your path.
Make sure the timeline/layers panel is open by choosing Window > Timeline.
Add a rectangular object to the workspace with the Rectangle tool (r key).
Name the layer with the rectangle, content.
Right-click the name content in the content layer and choose Add Motion Guide from the pull-down menu.
Using the Pen tool, draw a shape to define the object's path on the guide layer.
Click frame 20 of the guide layer and press F5 to extend the guide to frame 20.
Click frame 20 of the content layer and press F6 to add a keyframe with the content from frame one.
Click frame one of the content layer and move the rectangle to one end of the path.
Click frame 20 of the content layer and move the rectangle to other end of the path.
Right mouse-click the area between the keyframes on the content layer and choose Create Motion Tween from the menu.
Test your movie (Control > Test Movie) (Cmd/Return (PC-Ctrl/Enter) to view the animation.