const INTERNET_CONNECTION_MODEM = 1;
      INTERNET_CONNECTION_LAN   = 2;
      INTERNET_CONNECTdState';

{$R *.DFM}

procedure TForm1.CheckState(Sender: TObject);
var
  dwConnectionTypes: DWORD;
begin
  dwConnectionTypes:=IC_MODEM+IC_LAN+IC_PROXY;
  if InternetGetConnectedState(@dwConnectionTypes,0) then
    ShowMessage('Youa connected')
  else
    ShowMessage('No Connection');
end;