Отменить контекстное меню в WebBrowser

var 
  HookID: THandle; 

function MouseProc(nCode: Integer; wParam, lParam: Longint): Longint; stdcall; 
var 
  szClassName: array[0..255] of Char; 
const 
  ie_name = "Internet Explorer_Server"; 
begin 
  case nCode < 0 of 
    True: 
      Result := CallNextHookEx(HookID, nCode, wParam, lParam) 
      else 
        case wParam of 
          WM_RBUTTONDOWN, 
          WM_RBUTTONUP: 
            begin 
              GetClassName(PMOUSEHOOKSTRUCT(lParam)^.HWND, szClassName, SizeOf(szClassName)); 
              if lstrcmp(@szClassName[0], @ie_name[1]) = 0 then 
                Result := HC_SKIP 
              else 
                Result := CallNextHookEx(HookID, nCode, wParam, lParam); 
            end 
            else 
              Result := CallNextHookEx(HookID, nCode, wParam, lParam); 
        end; 
  end; 
end; 

procedure TForm1.FormCreate(Sender: TObject); 
begin 
  HookID := SetWindowsHookEx(WH_MOUSE, MouseProc, 0, GetCurrentThreadId()); 
end; 

procedure TForm1.FormDestroy(Sender: TObject); 
begin 
  if HookID <> 0 then 
    UnHookWindowsHookEx(HookID); 
end; 

procedure TForm1.Button1Click(Sender: TObject); 
begin 
  Webbrowser1.Navigate("?wurl=www.google.com"); 
end;