[jQuery] Sortserialize returns nothing

[jQuery] Sortserialize returns nothing


I'm stuck! I have followed the examples there is, but I can't make
this work. My code below just generates an empty alert box:
<script>
$(document).ready(function(){
$("#myList").sortable({
        update : function(e, ui)
        {
            serialize("#myList");
        }
    });
});
function serialize(s)
{
    serial = jQuery.SortSerialize(s);
    alert(serial.hash);
};
</script>
<style>ul { list-style: none; }
li { background: #727EA3; color: #FFF; width: 100px; margin: 5px; font-
size: 10px; font-family: Arial; padding: 3px; }</style>
</head>
<body>
<ul id="myList">
     <li id="11">Item 1</li>
     <li id="23">Item 2</li>
     <li id="33">Item 3</li>
     <li id="44">Item 4</li>
</ul>