อยากทำให้ add แถ้วของ text และเลือกจาก combobox 1 2 ให้ขึ้นข้อความ auto

<form id="form1" name="form1" method="post" action="">
  <p align="center">
    <input type="button" name="Button" value="Insert" onclick="insert_rows()"/>
  </p>
  <table id="table_view" width="750" border="0" align="center" cellpadding="3" cellspacing="0">
    <tr>
      <td width="187">&nbsp;</td>
      <td width="187">&nbsp;</td>
      <td>&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
  </table>
</form>

<script>
function insert_rows(){
	var table = document.getElementById("table_view")
	var lastRow = table.rows.length
	var newRow = table.insertRow(lastRow)
	var newCell_A = newRow.insertCell(0);
	var newCell_B = newRow.insertCell(1);
	var newCell_C = newRow.insertCell(2);
	var newCell_D = newRow.insertCell(3);
	
	var sel_A = document.createElement('select');
		sel_A.name = "sboxA[]";
		sel_A.id = "sboxA[]";
		sel_A.options[0] = new Option('Option0', 'Option0');
		newCell_A.appendChild(sel_A);
		
	var sel_B = document.createElement('select');
		sel_B.name = "sboxB[]";
		sel_B.id = "sboxB[]";
		sel_B.options[0] = new Option('Option0', 'Option0');
		newCell_B.appendChild(sel_B);
		
	var text_A = document.createElement('input');
		text_A.type = "text";
		text_A.name = "txtA[]";
		text_A.id = "txtA[]";
		text_A.size = 30;
		newCell_C.appendChild(text_A);
		
	var text_B = document.createElement('input');
		text_B.type = "text";
		text_B.name = "txtB[]";
		text_B.id = "txtB[]";
		text_B.size = 30;
		newCell_D.appendChild(text_B);
}

</script>