function showDbTip(elem_id, mode) {
  tl = document.getElementById(elem_id);
  if (mode == false) {
    tl.style.visibility = 'hidden';
  } else {
    at = document.getElementById('amTip')
    if (at) {
      at.style.visibility = 'hidden';
    }
    lct = document.getElementById('loccatTip')
    if (lct) {
      lct.style.visibility = 'hidden';
    }
    tt = document.getElementById('thomTip')
    if (tt) {
      tt.style.visibility = 'hidden';
    }
    pt = document.getElementById('ppocTip')
    if (pt) {
      pt.style.visibility = 'hidden';
    }
    lt = document.getElementById('locTip')
    if (lt) {
      lt.style.visibility = 'hidden';
    }
    tl.style.visibility = 'visible';
  }
}