[nik1967]

fackir, или так

Код:

procedure CurStepChanged(CurStep: TSetupStep);
var  
  ErrorCode: Integer;  
begin  
  if CurStep = ssDone then 
  ShellExec('open', 'http://mi_site.ru', '', '', SW_SHOWNORMAL, ewNoWait, ErrorCode);  
end;