There are many websites in the Internet built using Macromedia Flash technology. You probably saw different types of scrolling on those websites. I would like to show you one of the easiest ways to create a scroll bar with the mask. It may be used not only for text scrolling but you may also put images into that scrolling. If you experience some difficulties while reading this tutorial it is recommended to read all the previous tutorials on http://www.metamorphozis.com written by me as some aspects might be discussed earlier.
1. Launch Flash MX 2004
2. Create new Flash file. Click File > New...

3. Select Flash Document in a new window

4. Create 2 blank layers. Name the first one "Buttons" and the second one "Mask and Content"

5. Select the "Mask and Content" layer and with the "Rectangle Tool" draw a simple rectangle shape. Set the shape color to black.

6. Select the "Buttons" layer and drag it to the top then with the "Pen Tool" draw up and down arrows.
