Check uncheck all checkboxes javascript

Hi friends. To check or uncheck form check boxes, use this javascript function.
Its jQuery version is available in another article named Check uncheck all checkboxes with jQuery

The Html Form [ For static contents ]

 <script type="text/javascript">
  function checkAll(formName, status){
   for (i = 0; i < formName.length; i++)
   formName[i].checked = status.checked? true:false
   }
 </script>
  
 <form name ="checkForm">
  <input type="checkbox" name="all" 
      onClick="checkAll(this.form,this)">Check/Uncheck All
  <input type="checkbox" name="one" value ="one">One
  <input type="checkbox" name="two" value ="two">Two
  <input type="checkbox" name="three" value ="three">Three
  <input type="checkbox" name="four" value ="four">Four
  <input type="checkbox" name="five" value ="five">Five
 </form>

The Php Form [ For Dynamic Contents ]

 <script type="text/javascript">
  function checkAll(formName, status){
   for (i = 0; i < formName.length; i++)
   formName[i].checked = status.checked? true:false
   }
 </script>
 
 <form name ="checkForm">
  <input type="checkbox" name="all" 
        onClick="checkAll(this.form,this)">Check/Uncheck All
  <?php
  mysql_connect('localhost','username','password');
  mysql_select_db('databaseName');
  
  $sql="select id,name from tableName";
  $res=mysql_query($sql);
  while($row=mysql_fetch_array($res)){
   echo '<input type="checkbox" name="chk[]" 
       value ='.$row["id"].'>'.$row["name"].'<br>';
  }
  ?>
 </form>

The Example

Check/Uncheck All
One
Two
Three
Four
Five