SO fiddle
Test Fiddle mainly for SO Questions
by Nick Craver
HTML
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div class="pod">
<li id='ThirdParty'>
<div class='block'>
<h1>ThirdParty</h1>
<div class='systemHeader'>
<h2><span>Bobs shop</span></h2>
<div class='subSystems'>
<div class='subSystemHeader'>
<h3><span> Gifts</span></h3>
<div class='reports '>
<p class='reports i1'>
<a href='/Next.Whs.Web.MenuSystem/Default.aspx?id=470' title=''>Option 1</a></p>
</div>
</div>
</div>
</div>
</div>
</li>
</div>
JavaScript
$("div.subSystemHeader").click(function(e) {
if(e.target.nodeName == 'A') return; //skip this handler, don't return false
$("> div", this).slideToggle();
return false;
});