jquery event trigger twice

// HTML
<label for="i18n">
      <input type="checkbox" checked="checked" value="1" name="" id="i18n">
      Languages &amp; Abroad    </label>

// EVENT ATTACHMENT
  $('#facets label').click( function (event) { filterResume($(this)); } ); // attach filtering events

// EVENT FUCNTION
function filterResume(item)
{// show/hide item in the resume/CV
  var item  = item.find('input');
  var state = item.val();
  var id      = item.attr('id');
//   alert('filter['+item+']='+state);

  if (state==0)
  {// show
    $('.' + id).slideToggle(1000);
    item.val(1);
  } else
  {// hide
    $('.' + id).slideToggle(1000);
    item.val(0);
    }
}