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document.onreadystatechange = function() {
    if (document.readyState === 'complete') {
        $("ul.navbar-nav ul.dropdown-menu").each(function(){
            var parentWidth = $(this).parent().innerWidth();
            var menuWidth = $(this).innerWidth();
            var margin = (parentWidth / 2 ) - (menuWidth / 2);
            margin = margin + "px";
            $(this).css("margin-left", margin);
            $(this).css("right", "auto");
        });
    }
}