jquery Gurus please tell me what is wrong with this code:

jquery Gurus please tell me what is wrong with this code:

When I click submit nothing happens. What I expect to happen is that when I click submit the text in the text box should me copied into the div.

<!DOCUMENT html>
<html>
<head>
    <title>jQuery Functionality</title>
    <style type="text/css">
        #display{
            width: 250px;
            height: 250px;
            border: 1px dashed grey;
        }
    </style>
</head>
<body>
    <script type="text/javascript">
        $(function(){
            $("#submit").click(function(){
                var txt = $("#txtBox").val();
                alert("txt = " + txt);
                $("#display").html = txt;
            })
        });
    </script>

    <input id="txtBox" type="text"/>
    <button id="submit">Submit</button>
    <div id="display"></div>
</body>
</html>