[jQuery] jquery.stylish-select.js - problem in Internet Explorer

I'm using Jquery's "Stylish Select" plugin to replace a dropdown box
in a form (ie: "Facility Type"):

http://www.coverall.com/cnaws/quoterequest.aspx

Although it's working fine in both Firefox and Safari, .. I'm having a
problem with it in IE 7/8.

The first problem that I'm having is that I'm getting a strange
Javascript error message when I click on and try to select one of the
options in the dropdown box:

Message: 'length' is null or not an object
Line: 172
Char: 17
Code: 0
URI: http://www.coverall.com/cnaws/WebResource.axd?d=w7y_20eVwtqkECBvGtTXhctz7tfIr5GP58PmekFUdQI1&t=633700576732852734

The second problem that I'm having (which I suspect is related to the
javascript error message I'm getting in some way) ... is that I am not
able to select any of the options in the dropdown box.

The page that I'm trying to integrate this into is part of a .NET
application. Is it possible that there is something .NET specific
that is creating a conflict in IE? How can I fix this?

Thanks in advance,
- Yvan