AddThis

Omniture Integration

Hello,

I'm working on integrating omniture to addthis share buttons.
I came across the page about omniture integration. But I'm not sure where to place the following code:-

// Listen for the share event
addthis.addEventListener('addthis.menu.share', shareEventHandler);

I've tried adding it to the html page where it contains the share buttons. But the event gets listened each time the page loads, which is not what i want.
Like the following code:

<div class="addthis_toolbox addthis_default_style" id="addthis_container">
<a class="addthis_button_facebook_like" fb:like:layout="button_count" id="addthis_facebook"></a>
<a class="addthis_button_tweet"></a>
<a class="addthis_button_google_plusone" g:plusone:size="medium"></a>
</div>
<script type="text/javascript">
jQuery(document).ready(function() {
addthis.addEventListener('addthis.ready', trackOmniture);
});
</script>

The event supposed to be triggered each time the share buttons are clicked.
How can we do that?