<html>
<head>
<script type=”text/javascript”>
function disable()
  {
  document.getElementById(“mySelect”).disabled=true
  }
function enable()
  {
  document.getElementById(“mySelect”).disabled=false
  }
</script>
</head>
<body>

<form>
<select id=”mySelect”>
  <option>Apple</option>
  <option>Pear</option>
  <option>Banana</option>
  <option>Orange</option>
</select>
<br /><br />
<input type=”button” onclick=”disable()” value=”Disable list”>
<input type=”button” onclick=”enable()” value=”Enable list”>
</form>

</body>
</html>