From: Aguilera, Alexandre Aguilera, on
The file C: \ Program Files \ Microsoft ASP.NET \ ASP.NET 2.0 AJAX Extensions
\ v1.0.61025 \ MicrosoftAjaxLibrary \ System.Web.Extensions \ 1.0.61025.0 \
MicrosoftAjaxWebForms.js contains this bit of code that is identified as
problem described above.
Now to solve, I've updated the scripts of this page with the version found
in codeplex.com (AspNetAjaxLibraryBeta0911)