mozilla and ebay

Hey, I’m a newbie to mozilla and I think it works great. haven’t had the weird network issues that I have w/IE. However, I run into a snag when I’m on e-bay, more specifically, when I try to go to ‘my ebay.’ I get a pop-up box from mozilla telling me:

You have chosen to open

ebayISAPI.dll

from: http://cgi1.ebay.com/aw-cgi/

which is a: application/x-msdownload

Then it asks (well tells, really, b/c there is only one option highlighted) me to save to disk, and it asks for a file location.

How do I resolve this?

Thanks for the help.