Table

Table

HTML

<table id="myTable">
  <tr>
    <td>Cell1</td>
    <td>Cell2</td>
    <td>Cell3</td>
    <td>Cell4</td>
  </tr>
</table>

JavaScript

var Table = document.getElementById("myTable");
var newRow = Table.insertRow(1);
var newCell1 = newRow.insertCell(0);
var newCell2 = newRow.insertCell(1);
newCell1.innerHTML = Table.rows[0].cells[2].innerHTML;
newCell2.innerHTML = Table.rows[0].cells[3].innerHTML;
Table.rows[0].deleteCell(3);
Table.rows[0].deleteCell(2);