Jquery TreeView Menu Plugin

Jquery TreeView Menu Plugin

Originated From: Link

I have this one;

<div id="kiri">
                            <!-- ordered ul started -->
                            <ul id="menu" class="closed" >Management Setup
                                <li id="supplier">Supplier</li>
                                <li id="customer">Customer</li>
                                <li id="staff">Staff</li>
                                <li id="bank">Bank</li>
                                <li id="stock">Stock</li>
                            </ul> <!-- ordered ul ended -->

And I have the jquery this one;

// the tree clickable
    $('#menu').treeview( {
        collapse: false,
        animated: 'fast',
        unique: true

But why it's not working? 
Which part that I forgotten?