SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by André Albson

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">
<div id="dropdown">
<button> <span>opa</span>
    <ul>
      <li>29</li>
      <li>16</li>
      <li>16</li>
      <li>16</li>
    </ul>
    </button>
</div>

JavaScript

//var count = $("#selected>ul>li").length;
//alert(count);

var count2 = $("ul").children().length;
alert(count2);