function ReplaceBg(tbl)
{
  tbl.style.background = "url('./img/1_1.gif') no-repeat 170px";
}

function RemoveBg(tbl)
{
  tbl.style.background = "url('./img/1.gif') no-repeat  170px";
}

function RemoveBg2(tbl)
{
  tbl.style.background = "url('./img/2.gif') no-repeat  170px";
}

  function ReplaceBg3(tbl)
  {
    tbl.style.background = "url('./img/ico_li.gif') no-repeat left";
  }

  function RemoveBg3(tbl)
  {
    tbl.style.background = "url('./img/ico_li_active.gif') no-repeat left";
  }