AddThis

Stop Floating Toolbox at Certain Point?

<!-- AddThis Button BEGIN -->
<div class="addthis_toolbox addthis_floating_style addthis_counter_style" style="left:50px;top:50px;">
<a class="addthis_button_facebook_like" fb:like:layout="box_count"></a>
<a class="addthis_button_tweet" tw:count="vertical"></a>
<a class="addthis_button_google_plusone" g:plusone:size="tall"></a>
<a class="addthis_counter"></a>
</div>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=xxx"></script>
<!-- AddThis Button END -->

Given the code above, is there anyway to stop the floating div at a certain point on the page? I'd like it to stop before my footer div so that it doesn't overlap it when the page is scrolled all the way to the bottom.

Thanks in Advance!