How to get the class of the clicked element?

I can’t figure it out how to get the class value of the clicked element.

When I use the code bellow, I get “node-205” every time.

jQuery:

.find('> ul')
.tabs(
{
    selectedClass: 'active',
    select: function (event, ui) {
        //shows only the first element of list
        $(this).children('li').attr('class');
    },
    cookie: { expires: 0 },
    fx: fx
})

HTML:

<ul class="tabs">
  <li class="node-205"></li>
  <li class="node-150"></li>
  <li class="node-160"></li>
</ul>