Ajax functionality is integrated in ASP.NET 3.5 SP1
Ajax functionality is integrated in ASP.NET 3.5 SP1 and does not require any additional downloads.
To use Ajax, login to DNP (your control panel aka. DotNetPanel) -> Web Sites section and click on the website you want to use it with. Then click on the Extensions tab, and change the ASP.NET from the drop down to "2.0 Integrated Pipeline"