If you want to center that div you can do this:
Code:
<center><div class="a2a_kit a2a_default_style">
<a class="a2a_dd" href="http://www.addtoany.com/share_save">Share</a>
<span class="a2a_divider"></span>
<a class="a2a_button_facebook"></a>
<a class="a2a_button_twitter"></a>
<a class="a2a_button_email"></a>
</div></center>
<script type="text/javascript"> 
var a2a_config = a2a_config || {};
a2a_config.onclick = 1;
a2a_config.num_services = 6;
</script>
<script type="text/javascript" src="http://static.addtoany.com/menu/page.js"></script>
But there can be problem with links, so in css you can add :
Code:
#a2a_kit a2a_default_style {
margin-left:auto;
margin-right:auto;
}
Try both and tell me does that work.