function s_acCheckAll(oInput, slug){
  if ( slug.length > 0 ){
    var s_fields = document.getElementsByName('s_article_category[]');
    for ( i=0; i < s_fields.length; i++){
      if ( s_fields[i].id.indexOf('_'+slug+'_') >= 0 ){
        if ( oInput.checked ){
          s_fields[i].checked = true;
        }else{
          s_fields[i].checked = false;
        }
      }
    }
  }
}