Update November 20th: Well, a quick search of StackOverflow.com, and it turns out that I’m not exactly alone in this matter. According to this post (and Grant in the comments of this post), in versions of IE < 8, one must use the click event, and not the change event. I ran into an interesting issue today. I don't really know the answer, but I figured I would blog about it so that I don't completely forget it.
In my last post, I described how easy jQuery makes it to call an ASP.NET Web Service via AJAX. Currently, I'm developing on Windows XP (SP2), Resharper 4 (running inside Visual Studio 2008), and using the Visual Studio Web Server. We deploy to Windows 2003 R2/IIS6. When I pushed the code described in my last post to the development server to test it out there, the web service call kept failing with an HTTP Status of 500 (internal error).