Compile WebSite Project with NAnt

I have a website project in Visual Studio 2008. I would like to create this site using MSBuild. I use the following command to create a solution:

msbuild.exe mysolution.sln / t: Repair / v: q

After running this command, a new folder called precompiled is created, a copy of my project is created, all code files are removed, and 1000 DLL files are placed in the bin folder.

Now when I do a "rebuild" from Visual Studio it doesn't.

Is there a way to rebuild the project without creating a precompiled folder?

thank