text: function filter(term, _id, cellNr){
      var suche = term.value.toLowerCase();
      var table = document.getElementById(_id);
      var ele;
      for (var r = 1; r < table.rows.length; r++) {
          ele = table.rows[r].cells[cellNr].innerHTML.replace(/<[^>]+>/g, "");
          if (ele.toLowerCase().indexOf(suche) >= 0) 
              table.rows[r].style.display = '';
          else 
              table.rows[r].style.display = 'none';
      }
  }