How to change selected menu option using jquery

How to change selected menu option using jquery

HTML

<select id="second" class="chzn-select" style="width: 100px">
    <option value="1">one</option>
    <option value="2">two</option>
</select>

JavaScript

$(document).ready(function () {
     $('.chzn-select').change(function () {
         alert( $('.chzn-select option:selected').text());
     });
 });