AddThis to block ie8

gistfile1.txt

<!-- AddThis Button BEGIN -->
<div class="addthis_toolbox addthis_default_style addthis_32x32_style">
<a class="addthis_button_email"></a>
<a class="addthis_button_facebook"></a>
<a class="addthis_button_twitter"></a>
<a class="addthis_button_google_plusone_share"></a>
<a class="addthis_button_compact"></a><a class="addthis_counter addthis_bubble_style"></a>
</div>
<script>
    function loadScript(url, callback) {

        var script = document.createElement("script")
        script.type = "text/javascript";

        if (script.readyState) {  //IE
            script.onreadystatechange = function () {
                if (script.readyState == "loaded" ||
                        script.readyState == "complete") {
                    script.onreadystatechange = null;
                    callback();
                }
            };
        } else {  //Others
            script.onload = function () {
                callback();
            };
        }

        script.src = url;
        document.getElementsByTagName("head")[0].appendChild(script);
    }
    if (!$('html').hasClass('ie8')) {
        loadScript('//s7.addthis.com/js/300/addthis_widget.js#pubid=xa-51e6b48a509222f7','')
    }
</script>
<!-- AddThis Button END -->