WAI ARIA show/read describedby info on click
===

I have a help link which toggles p#hlp. Between these elements there is a checkbox area. I need to make help info avaliable (read p) on link click, not on focus.

    <form name="name">
      <fieldset>
      <legend>legend</legend>
      <a class="help" title="help-button" href="#" aria-describedby="hlp" >Help</a>
      <div class="check">
         <label class="radio">10</label><input type="radio" name="p-v">
         <label class="radio">20</label><input type="radio" name="p-v">
         <label class="radio">Input</label><input type="radio" name="p-v">
      </div>
      <div class="expln">
         <p id="hlp">Help info: Lorem ipsum blah blah blah</p>
      </div>
    </fieldset>
    </form>