[jQuery] Accordion Active 2 -trouble with selector in javascript function

[guru520]

function activities(obj)
         {
           $(document).ready(function() {
                $('.ui-accordion-container').accordion('option', 'active', 3);

                });
         }


 <div>
  <input name="Submit" type="submit" value="Activities &gt;&gt;"
onclick="activities(this)" />
 </div>


<ul id="acc1" class="ui-accordion-container">

 <li>
  <div class="ui-accordion-left"></div>
   <a class="ui-accordion-link acc1">Personal Info</a><!---1st bar--->
        <div>
         <ul class="ui-accordion-container" id="acc2">
          <li style="margin-left:10px;">
           <div class="ui-accordion-left"></div>
                <a class="ui-accordion-link acc2" id="name">Your 
Name</a><!---1st
sub-bar--->
           <div style="margin-left:10px;" id="piData" >
                first<br />
                Middle<br />
                last<br />
           </div>
          </li>
         <li style="margin-left:10px;">
          <div class="ui-accordion-left"></div>
           <a class="ui-accordion-link acc2" id="contactInfo">Contact
Information</a><!---2nd sub-bar--->
          <div>
           Phone<br />
           Address<br />
           Email<br />
          </div>
         </li>
        </ul>
   </div>
 </li>
</ul>


I have several headers such as the one provided Personal Info: I want
a button that calls function activities(). In function activities I
want to set the active header to open.  Not sure what to pass in the
onClick(). Do I pass onClick="activities(document.IDofAccordion)" ?
How do I define the parameter passed in? is it

function activites(obj)?

Tried several things having trouble.  I do hope I have provided the
correct info to help me. Thx.