Creating a Menu from existing markup with items organized into groups

The markup for a Menu control follows that of YAHOO.widget.Module, with its body element (<div class="bd"/>) containing a list element (<ul/>).

Each item in a Menu is represented by a list item element (<li class="yuimenuitem"/>), each of which has a label (<a class="yuimenuitemlabel"/>) that can contain plain text or HTML.

The body of Menu can house many <ul/> elements to organize related items into groups.

To instantiate a Menu, pass the id of its corresponding HTML element (in this case "basicmenu") to the Menu constructor (YAHOO.widget.Menu). Once instantiated, it is necessary to call the render method. If you are creating a Menu from markup that exists in the page you call render with no arguments.