Need a folder browser dialog control for ASP.NET 2.0

Does anyone know of a dialog control for ASP.NET 2.0 that will browse to a drive folder? I know how to do this in C# for a windows app, but I need to do this in a web app. I need something similar to the Fileupload control. The problem with the FileUpload control is that you have to select a file. It won't return a folder!

thanks in advance for the help.

Greg