function jumplang(event) {
    if(event.target) {
        select_item = event.target;
    } else {
        select_item = event.srcElement;
    }
    i = select_item.selectedIndex;
    window.location.href = langpages[i];
}

addEvent(window, 
            'load', 
            function() {
                    addEvent(document.getElementById('language_select'), 'change', jumplang, false);
                    }, 
            false
        );