function qmark_on(text) {
  var d = document.getElementById('context_help');
  //if(d.firstChild == null) {
    d.appendChild(document.createTextNode(text));
    d.appendChild(document.createElement('br'));
  //}
  //else {
  //  d.firstChild.data = text;
  //}
}

function qmark_off() {
  var d = document.getElementById('context_help');
  while(d.firstChild) {
    d.removeChild(d.firstChild);
  }
  //d.firstChild.data = '';
}