Insert add this if not IE

gistfile1.js

(function($, jwplayer) {
    if (!($.browser.msie && (parseInt($.browser.version) < 8))) {
        var script = document.createElement('script');
        script.type = 'text/javascript';
        script.innerHTML = 'var switchTo5x=true;';
        $('head').append(script);

        script = document.createElement('script');
        script.type = 'text/javascript';
        script.src = 'http://w.sharethis.com/button/buttons.js';
        $('head').append(script);

        script = document.createElement('script');
        script.type = 'text/javascript';
        script.innerHTML = "stLight.options({publisher:'15276335-21a3-42fa-8721-8639f7d0d912'});";
        $('head').append(script);
    }
})(jQuery, jwplayer);