> If this function is called, the image instantly leaps from its present
> position to a new position at 500 pixels (left edge of image), as if
> the "for" counter wasn't even there. I would like the image to move
> *slowly* across the page. I figured a setTimeout() or maybe a
> setInterval() would do the job, but still can't figure out how to get
> it to work.

Here's a link that is a tutorial on just this issue:
http://www.the-cool-place.co.uk/javascript/tutorial/javascript2.html

There are several "examples" on the tutorial web page.  Search for 
the one toward the end of the page titled "try this out".

Good Luck!

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