Added a Ya­hoo! Ui menubar gen­er­a­tor. It turns this:

a
b
c
 1
 2
  x
  y
d

In­to this:

Or this if you are us­ing links:

Or rather in­to this, which ex­plains why it's nec­es­sary (con­sid­er this is a very sim­ple menu!):

<script type="text/javascript">
YAHOO.example.onMenuBarReady = function(p_oEvent)
{
    // Instantiate and render the menu bar

    var oMenuBar = new YAHOO.widget.MenuBar("None",
        {   autosubmenudisplay:true,
            hidedelay:750,
            lazyload:true
        });

    oMenuBar.render();
}

// Initialize and render the menu bar when it is available in the DOM
YAHOO.util.Event.onContentReady("None", YAHOO.example.onMenuBarReady);
</script>
        <div id="None" class="yuimenubar">
            <div class="bd">
                <ul class="first-of-type">
                    <li class="yuimenubaritem first-of-type">a </li>
                    <li class="yuimenubaritem">b</li>
                    <li class="yuimenubaritem"> c
                        <div id="c" class="yuimenu">
                            <div class="bd">
                                <ul>
                                    <li class="yuimenuitem"> 1</li>
                                    <li class="yuimenuitem"> 2
                                        <div id=" 2" class="yuimenu">
                                            <div class="bd">
                                                <ul class="first-of-type">
                                    <li class="yuimenuitem">  x</li>
                                    <li class="yuimenuitem">  y</li>
                                                </ul>
                                            </div>
                                        </div>
                                    </li>
                                </ul>
                            </div>
                        </div>
                    </li>
                    <li class="yuimenubaritem">d</li>
                </ul>
            </div>
        </div>

Still some miss­ing fea­tures, but a neat thingie al­ready.