Javascript code to add GRIDVIEW row

Introduction:  JavaScript Code to add row to a GridView.

Code:

<script type="text/javascript" lang="ja">

 function AddNewRecord() {

      var grd = document.getElementById('<%=gvportfolio.ClientID%>');

      var tbod = grd.rows[0].parentNode;

      var newRow = grd.rows[grd.rows.length - 1].cloneNode(true);

      tbod.appendChild(newRow);

      }

</script>