var s;
$.fn.repLink = function() {
    s = $(this).html();
    function rep(re, str) {
        s = s.replace(re, str);
    };
    rep(/http\:\/\/([^<>\s]*)/gi, "<a href=\"http\:\/\/$1\" target=\"_blank\">http://$1</a>");
    $(this).html(s);
}