function page_setup() {
    var out = [];
    var tmenu = document.getElementById('tmenu');
    if (!tmenu) return;
    var elA = tmenu.getElementsByTagName('a');
    var prev = '';
    var cur = '';
    var next = '';
    var regex = new RegExp("#(.*)$");
    for (var i = 0; i < elA.length; i++) {
        if (elA[i].href.match(regex)) {
            cur = RegExp.$1;
            prev = '';
            if (i != elA.length - 1 && elA[i + 1].href.match(regex)) {
                prev = RegExp.$1;
            }
            var elWrapper = document.getElementById(cur);
            if (elWrapper) {
                var html = '<div class="np-navi">';
                if (prev) {
                    html += '<a href="#' + prev + '"><img src="images/prev.png"></a>';
                } else {
                    html += '<img src="images/prev_na.png">';
                }
                if (next) {
                    html += '<a href="#' + next + '"><img src="images/next.png"></a>';
                } else {
                    html += '<img src="images/next_na.png">';
                }
                html += '</div>';
                elDiv = elWrapper.getElementsByTagName('div');
                for (var j = 0; j < elDiv.length; j++) {
                    if (elDiv[j].className == 'content') {
                        elDiv[j].innerHTML += html;
                        break;
                    }
                }
            }
        }
        next = cur;
    }
}