You'd need to edit the HTML of your eBay listing directly. Unless you're a bit comfortable with HTML, I wouldn't recommend it. If you decide to try it, you need to copy and paste all of your HTML over to Notepad, or some other text editor, so that if you mess something up, you can restore the HTML. Use the "Preview" funtion when editing the listing and make sure everything looks OK before you commit to any changes.
Here's a hint, the scrolling window script begins with
<div><!--ASW-->and it ends with
</tbody></table>Which is just before the Sellathon script, which looks like this
<!--ASW--><div><d div=""></d><!-- Begin: Sellathon -->Don't delete anything in the Sellathon script, though. You can also copy and paste the edited HTML into
www.practiceboard.com to see what it will look like.
I must stress again, though, if you're at all uncomfortable working with HTML, you probably shouldn't do it.