"'Sys' is undefined" error running ASP.NET MVC application in IIS7

Answer 1

I would look at the paths for the javascript includes to make sure that they are correct for the path used in IIS7. I've taken to using Url.Content() to make sure that my paths are defined correctly with respect to the root path of the application.

 <script type='text/javascript'
         src='<%= Url.Content( "~/Scripts/jquery-1.3.1.min.js" ) %>'>
 </script>