/* reset search terms */
function clearElements() {
  var f = document.advancedsearch;
  for(var i=2; i < f.length - 2; i++) {
    var e = f.elements[i];
    e.value = null;
  }
}

function set_visibility(field,id) {
  var visibility = 'hidden';
  var display    = 'none';
  var value      = 0;

  eval("value = document.registration."+field+".checked");
  if (value) {
    visibility = 'visible';
    display    = 'block';
  }
  document.getElementById(id).style.visibility=visibility;
  document.getElementById(id).style.display=display;
}