function showhide(div) {
  if (document.getElementById(div)) {
    if (document.getElementById(div).style.display=="block")
      document.getElementById(div).style.display="none";
    else
      document.getElementById(div).style.display="block";
  }
}

function openmenu(cat1,cat2,cat3) {
  if (cat1>0) showhide('sm'+cat1);
  if (cat2>0) showhide('sm'+cat2);
}