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Before you close the Page Options dialog, select the Grid and Ruler tab and change the Major Spacing to 100pix (type it exactly like this) and the Number of Subdivisions to 10.
Click OK and we're ready to begin the tutorial.

Creating a Simple Animation

This exercise will not get you a job at Disney Studios, but it will show you how the animation process works. Because most animations end up (for better or worse) on a web page, it's best to change your units to Pixels. Pixels (as opposed to pixies) represent the smallest element a screen can display. In the immortal words of David Mathewman, a pixel is a pixel is a pixel. (He really said that). In essence, a pixel will be the same size on any screen depending on the screen resolution. The higher the monitor resolution (1600 x 1200 or 1024 x 768 vs. 640 x 480), the smaller the pixel.

On the other hand, a fraction of a pixel is not a pixel, is not a pixel, is not a pixel, and can result in nettlesome faint outlines around an image. To avoid these vexing fractional pixels, it is best to work in even, not fractional pixels. OK, you sold me. How?

Click on an empty portion of the screen with the right mouse button. You'll know it's the right mouse button if a small menu pops up with Page Options at the bottom.

Click Page Options which opens the Page Options dialog. Select the Units tab and select Pixels from the drop down list. Your Color Units should be set to 0-255.