How can I get the rowcount of a dynamic table using VBScript

function addRow(tableID) 
                                {   
  
            var table = document.getElementById(tableID);   
  
            var rowCount = table.rows.length;   
            var row = table.insertRow(rowCount);   
  
            var colCount = table.rows[0].cells.length;   
  
            for(var i=0; i<colCount; i++) 
                                                {   
  
                var newcell = row.insertCell(i);   
  
                newcell.innerHTML = table.rows[0].cells[i].innerHTML;   
                //alert(newcell.childNodes);   
                switch(newcell.childNodes[0].type) 
                                                                {   
                    case "text":   
                            newcell.childNodes[0].value = "";   
                            break;   
                    case "checkbox":   
                            newcell.childNodes[0].checked = false;   
                            break;   
                    case "select-one":   
                            newcell.childNodes[0].selectedIndex = 0;   
                            break;   
                }   
            }   
        }   
  
        function deleteRow(tableID) 
                                { 
            try 
                                                {   
                                                                var table = document.getElementById(tableID);   
                                                                var rowCount = table.rows.length;   
  
            for(var i=0; i<rowCount; i++) 
                                                {  
                var row = table.rows[i];   
                var chkbox = row.cells[3].childNodes[0];  
                                                                
                if(null != chkbox && true == chkbox.checked) 
                                                                {  
                    if(rowCount <= 1) 
                                                                                {   
                        alert("Cannot delete all the rows.");   
                        break;   
                    }   
                    table.deleteRow(i);   
                    rowCount--;   
                    i--;   
                }   
  
            }   
            } catch(e) {   
              alert("Problem");   
            }   
        }   
 
 
<table width="100%" border="0" cellspacing="2" cellpadding="1" id="dataTable">
     <tr>
        <td width="19%" align="left"><select name="skill" id="skill">
          <option value="X" selected="selected">SELECT ONE</option>
          <option value="S">Skill</option>
          <option value="K">Knowledge</option>
        </select></td>
        <td width="52%" align="left"><input name="skill_area" type="text" id="skill_area" size="50" maxlength="100" /></td>
        <td width="14%" align="left"><select name="rating" id="rating">
          <option value="0" selected="selected">SELECT ONE</option>
          <option value="1">1 - None</option>
          <option value="2">2 - Basic</option>
          <option value="3">3 - Average</option>
          <option value="4">4 - Good</option>
          <option value="5">5 - Proficient</option>
        </select></td>
        <td width="15%" align="left"><input type="checkbox" name="chk" id="chk" /></td>
        </tr>
    </table>

                                  

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