function btn_act(id, state)
{
  if (id=='all')
  {
    document.all['btn1'].style.background='url(/images/button.gif) repeat-x';
    document.all['btn1_m'].style.visibility='hidden';
    document.all['btn3'].style.background='url(/images/button.gif) repeat-x';
    document.all['btn3_m'].style.visibility='hidden';
  }
  else
  if (id=='btn1')
  {
    if (state=='activate')
    {
      document.all['btn1_m'].style.visibility='';
      document.all[id].style.background='url(/images/button_act.gif) repeat-x';
    }
    if (state=='hidden')
    {
      document.all['btn1_m'].style.visibility='hidden';
      document.all[id].style.background='url(/images/button.gif) repeat-x';
    }
  }
  else
    if (id=='btn3')
    {
      if (state=='activate')
      {
        document.all['btn3_m'].style.visibility='';
        document.all[id].style.background='url(/images/button_act.gif) repeat-x';
      }
      if (state=='hidden')
      {
        document.all['btn3_m'].style.visibility='hidden';
        document.all[id].style.background='url(/images/button.gif) repeat-x';
      }
    }
    else
      if (state=='activate')
      {
        document.all[id].style.background='url(/images/button_act.gif) repeat-x';
        document.all['btn1'].style.background='url(/images/button.gif) repeat-x';
        document.all['btn1_m'].style.visibility='hidden';
        document.all['btn3'].style.background='url(/images/button.gif) repeat-x';
        document.all['btn3_m'].style.visibility='hidden';
      }
      else
      {
        document.all[id].style.background='url(/images/button.gif) repeat-x';
      }
}