AddThis

disable address bar/

I prefer to disable the analytics address bar and have clear url's instead.
I have inserted the code below without any result. Still the analytics code of addthis is appearing in my address bar. How can I remove this permenantly?
See also: http://www.kluisstore.nl/lips-dataguard-nt-size-25-e.html
<div class="addthis_toolbox addthis_32x32_style addthis_default_style"><a class="addthis_button_twitter_follow"></a></div>
<script type="text/javascript">// <![CDATA[
if (typeof addthis_config !== "undefined") {
addthis_config.data_track_addressbar = false
} else {
var addthis_config = {
data_track_addressbar: false
};
}
// ]]></script>