jquery ui autocomplete in a nutshell

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css">
<div id="menu">
<ul >
<li>1</li>
<li>2</li>
</ul>
</div>

JavaScript

if ( $('#menu ul li').size() > 1 ) {
	//something should happen,
alert('success');
}