object.GetFolder(folderspec) 

function ShowFolderList(folderspec)
{
   var fso, f, fc, s;
   fso = new ActiveXObject("Scripting.FileSystemObject");
   f = fso.GetFolder(folderspec);
   fc = new Enumerator(f.SubFolders);
   s = "";
   for (; !fc.atEnd(); fc.moveNext())
   {
      s += fc.item();
      s += "<br>";
   }
   return(s);
}

Sub AddNewFolder(path, folderName)
   Dim fso, f, fc, nf
   Set fso = CreateObject("Scripting.FileSystemObject")
   Set f = fso.GetFolder(path)
   Set fc = f.SubFolders
   If folderName <> "" Then
      Set nf = fc.Add(folderName)
   Else
      Set nf = fc.Add("New Folder")
   End If
End Sub