Having a project created for Asp.NET 3.5 run under 2.0

I have created my First Web Site and it runs using the local IIS.  Now I want to move it to a Web Server that is running Asp.NET 2.0.
I see in the web.config file references to 3.5:
<compilation debug="false">

          <assemblies>
            <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assemb ...