$(document).ready(function () {
    /*
    ** check all links if linking to external pages
    */
    var host = window.location.hostname;

    $('#s4-mainarea').find('a').each(function (idx, item) {
        var linkHref = item.href;

        if (linkHref) {
            // check if link is external
            if ($(item).text() != "" && (linkHref.search(host) == -1 && linkHref.search(/^javascript:/) == -1 && linkHref.search(/^mailto:/) == -1)) {
                $(item).html("<span class='external'>" + $(item).html() + "</span>");
            }
        }
    });
});