How to create textfield in the form using JQuery

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>

<script language="javascript" type="text/javascript">

            $(function () {

                             alert($("#div2").html());
                             $("#div2").html("<input type='text' id='textbox1' value='Hello!!' />");
                   });

<div id="div2"></div>