y me ayude… con este codigo?
<html>
<HEAD>
 <script language="javascript">
      function addRow(tableID) {
	
       var table = document.getElementById(tableID);
       //var indice = document.fomulario.acuerdo.selectedIndex 
      // var valor=document.fomulario.acuerdo[indice].value 	
       var texto= document.fomulario.acuerdo[indice].text 
      var rowCount = table.rows.length;
      var fila=rowCount+1;
      var total=document.getElementById("atotal");
      total.value=fila;
     
     
          var row = table.insertRow(rowCount);
           var cell1 = row.insertCell(0);
           var element1 = document.createElement("input");
           element1.type = "checkbox";
           cell1.appendChild(element1);
       var cell2 = row.insertCell(1);
      
       var element2 = document.createElement("input");
       element2.type = "text";
       element2.name = "acuerdo"+fila;
       element2.size='43';
       element2.id= "acuerdo"+fila;			
       element2.value=texto
        cell2.appendChild(element2);
       
      }
      function deleteRow(tableID) {
           try {
           var table = document.getElementById(tableID);
           var rowCount = table.rows.length;
       var total=document.getElementById("atotal");
           for(var i=0; i<rowCount; i++) {
                var row = table.rows[i];
                var chkbox = row.cells[0].childNodes[0];
                if(null != chkbox && true == chkbox.checked) {
                     table.deleteRow(i);
                     rowCount--;
                     i--;
		
                }
	    
	 total.value=rowCount;
           }
        
		    	
           }catch(e) {
                alert(e);
           }
      
      }
 </SCRIPT>
</HEAD>
<BODY>
<form name="fomulario" id="fomulario" >
<input type="text" name="acuerdo"id="acuerdo">
</input><br>
 <INPUT type="button" value="Add Row" onclick="addRow('dataTable');" />
 <INPUT type="button" value="Delete Row" onclick="deleteRow('dataTable');" />
 <TABLE id="dataTable" width="350px" border="1"><INPUT type='hidden' value='  ' id='total' name='total'>
      
 </TABLE>
</form>
</BODY>
</html>