function setKeyword(val)
{
  var obj = $get('txtFree');
  var s = obj.value.replace(/^\s+|\s+$/g, '');
  obj.value = s.length==0 ? val: s + ' ' + val;
  obj.focus();
}

function changeChk(sender)
{
  if(sender.id=='chkRecommend')
  {
    var trg = $get('chkNowAvailable');
    if(sender.checked)
    {
      trg.checked=true;
    }else{
      $get('span_na').innerHTML = '';
    }
  }else{
    var trg = $get('chkRecommend');
    if(!sender.checked && trg.checked)
    {
      sender.checked = true;
      $get('span_na').innerHTML = 'おすすめを選択している場合は解除できません';
    }
  }

}