At the moment, this is pretty limited in its movement. When you get the script, you'll see where you can set wider parameters. Keep in mind, you'll need Netscape 4.0 or better to run this puppy.
Please note: This script is being offered in simple text format. When you click to Grab the Script, the text should display. Internet Explorer and AOL users may get a blank page or the script may run and produce the effect. If this happens, choose SAVE AS from the FILE menu and save the blank or compiled page.