Just drop it in your page before the </body> tag: <script language="javascript" type="text/javascript"> var prm = Sys.WebForms.PageRequestManager.getInstance(); prm.add_initializeRequest(InitializeRequest); prm.add_endRequest(EndRequest); var oldClass = ""; function...
To play around the AJAX APIs from Google, a playground was created as a 20% project: http://code.google.com/apis/ajax/playground/ Have a nice play :)