Select/Deselect All checkbox for checkboxes in next block element

I'm trying to deselect/select everything in the following dd.options based "dept_checkbox" being selected for each. Theres around 1 to 100+ checkboxes in each dd block( I put 2 courses in the first "dept_checkbox" section, and 1 in the next) for this snippet.

<div class="accordion">
  <dt><input class="dept_checkbox" type="checkbox" onclick="selectAll($(this).parent().next(".options") )"><a href="">EYES|VISI</a></dt>
  <dd class="options">
  <li>
    <label>
      <input type="checkbox" name="course_EYES|VISI" value="course_XXX">XXX
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox" name="course_EYES|VISI" value="course_YYY">YYY
    </label>
  </li>
  </dd>

  <dt><input class="dept_checkbox" type="checkbox" onclick="selectAll($(this).parent().next(".options") )"><a href="">EARS|HEAR</a></dt>
  <dd class="options">
  <li>
    <label>
      <input type="checkbox" name="course_EARS|HEAR" value="course_EEE">EEE
    </label>
  </li>
  </dd>      
</div>

I got the following so far far but I'm not sure how to go about it, I'm trying to accomplish this with jquery.

  function selectAll(pID ){
    $('.'+pID).find(':checkbox').each(function(){
        *SELECT ALL CHECKBOXES IN OPTIONS SECTION FOR THIS PARENT*
    });     
  }

I'm trying to stay away from calling any of the 'name' or 'value' values since they all change. Only things stay static(they will appear with all results) are 'dept_checkbox' for each of the Select all checkboxes and 'options' class which would hold the checkboxes for the previous select/deselect all button to work with.