AJAX Control Toolkit issue

I have been given an application's binaries which has been written in ASPX and C# (using .NET 2). Our task is to deploy it on our server. We have managed to set it up on the server but we get the following error:

Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dep开发者_如何学编程endencies. The system cannot find the file specified.

The line in web.config which has been highlighted reads as follows:

<add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

The server has .NET 2 framework installed and we're using a Win2003 server box with IIS 6.0. Unfortunatelly, we have limited experience in .NET as our main platform is in Java and we don't have a Visual Studio available. All we want to do is deploy the application.

Can anyone provide some help on how to surpass this issue?

Is AJAX Extensions installed on the machine?