//
function OnOff(hobby) {
  var i=hobby.selectedIndex;
  var t=hobby.options[i].text;
  var s=hobby.options[i].text.substring(1,t.length);

  if (hobby.options[i].className=='on') {
    hobby.options[i].className='off';
    hobby.options[i].text=t='-'+s;
  }
  else {
    hobby.options[i].className='on';
    hobby.options[i].text=t='+'+s;
  }
}
function SetHobby() {
  var hobby = document.getElementById('hobby');
  var v='';
  for (var i=0; i<hobby.length; i++)
    if (hobby.options[i].className=='on') v+=hobby.options[i].value;
  var phobby = document.getElementById('phobby');
  phobby.value=v;
}