Default Selector Settings

Default Selector Settings

I would like to know how I can make "item 2" in the following selectable snipit from an ordered list:
 
<span id="contents">
  <ol id="selectable">
    <li class="ui-state-default" id="item1"></li>
    <li class="ui-state-default" id="item2"></li>
    <li class="ui-state-default" id="item2"></li>
  </ol>
</span>