[jQuery] Accordion activate not working

[jQuery] Accordion activate not working


I have an accordion which i am trying to activate on page load, and
the .activate function doesn't appear to be working. can someone show
me how i'm implementing it incorrectly?
JavaScript:
    $(document).ready(function() {
        $('#childnav').accordion({
            autoheight: false,
            header: '.toggle',
            event: 'click',
            alwaysOpen: true,
            active: false
        });
        $(".toggle").activate(0);
    });
HTML:
<ul id="childnav">
    <li id="childnav_about">
        <div style="width:277px;height:5px;background:#014F75;"></div>
        <a href="#" class="toggle"><span>About Us</span></a>
        <ul class="childnav_sub">
            <li><a href="#">Link 1</a></li>
            <li><a href="#">Link 2</a></li>
        </ul>
    </li>
    <li id="childnav_homes">
        <img src="/images/childnav_spacer.jpg" alt="" />
        <a href="#" class="toggle"><span>New Homes</span></a>
        <ul class="childnav_sub">
            <li><a href="#">another link</a></li>
            <li><a href="#">another link</a></li>
        </ul>
    </li>
    <li id="childnav_community">
        <img src="/images/childnav_spacer.jpg" alt="" />
        <a href="#" class="toggle"><span>The Community</span></a>
        <ul class="childnav_sub">
            <li><a href="#">Arial PhotoGraph</a></li>
            <li><a href="#">Amenities</a></li>
            <li><a href="#">Schools</a></li>
            <li><a href="#">Utilities</a></li>
        </ul>
    </li>
    <li id="childnav_news">
        <img src="/images/childnav_spacer.jpg" alt="" />
        <a href="#" class="toggle"><span>News &amp; Events</span></a>
        <ul class="childnav_sub">
            <li><a href="#">Link 1</a></li>
            <li><a href="#">Link 2</a></li>
            <li><a href="#">Link 1</a></li>
            <li><a href="#">Link 2</a></li>
            <li><a href="#">Link 1</a></li>
            <li><a href="#">Link 2</a></li>
        </ul>
    </li>
    <li id="childnav_contact">
        <img src="/images/childnav_spacer.jpg" alt="" />
        <a href="#" class="toggle"><span>Contact Us</span></a>
        <ul class="childnav_sub">
            <li><a href="#">Link 1</a></li>
            <li><a href="#">Link 2</a></li>
            <li><a href="#">Link 1</a></li>
        </ul>
    </li>
</ul>