Sys.Application.add_init(appl_init);

function appl_init() {
    var pgRegMgr = Sys.WebForms.PageRequestManager.getInstance();

    pgRegMgr.add_pageLoaded(function () {

        if (window.addthis) {
            window.addthis = null;
            window._ate = null;
        }

        $.getScript("http://s7.addthis.com/js/250/addthis_widget.js#pubid=ra-4e84c49c75b82d18", function () {
                if (addthis != null)
                    addthis.init();
        });

    });


}