on check select all checkboxs in jquery

HTML Code is

<div>
Select All <input type="checkbox" name="select_all" id="select_all">
</div>

<div>
<table id="Optiontable">
  <tr>
     <td>
     <input type="checkbox" name="checkRow" id="checkRow" value""> Select-1
     </td>
  </tr>
  <tr>
     <td>
     <input type="checkbox" name="checkRow" id="checkRow" value=""> Select-2         
     </td>
  </tr>
  <tr>
     <td>
     <input type="checkbox" name="checkRow" id="checkRow" value=""> Select-3
     <td>
  </tr>
 </table>
</div>

Script Code::

<script>
$(document).ready(function()
{
 $('#select_all').on('click', function()
 {
 if (this.checked == true)
 { $('#Optiontable').find('input[name="checkRow"]').prop('checked', true);
 alert(AllcheckedRow114);
 }
 else
 {
 $('#Optiontable').find('input[name="checkRow"]').prop('checked', false);
 }
});
</script>