Accordion - Tracking Selected Item Header

HTML

<div id="accordion">
 <h3 class="ui-accordion-header"><a id="link1" href="#">First Header</a></h3>
    <div id="div1">First Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second Content</div>
 <h3 class="ui-accordion-header"><a id="link2" href="#">Second Header</a></h3>
  <div id="div2">Second ContentSecond ContentSecond ContentSecond ContentSecond ContentSecond ContentSecond ContentSecond ContentSecond...

JavaScript

$("#accordion").accordion({
  collapsible: true,
  active:false,
  navigation:true,
  autoHeight:false,
  change:function(event, ui){
    var currentHeaderID = ui.newHeader.find("a").attr("id");
      window.alert(currentHeaderID);
  }
});