function filtroff() {
    document.getElementById('down').innerHTML = '<span onclick="filtron();"><a href="javascript:;">Authors Login</a></span>';
    var n;
    for (n = 1; n < 120; n++) {
        setTimeout('filtr_zaezd(' + n + ')', n * 3);
    }
}
function filtron() {
    document.getElementById('down').innerHTML = '<span onclick="filtroff();"><a href="javascript:;">Authors Login</a></span>';
    document.getElementById('blok').style.display = 'block';
    var n;
    for (n = 1; n < 120; n++) {
        setTimeout('filtr_viezd(' + n + ')', 3 * n);
    }
}
function filtr_viezd(viezd) {
    viezd = viezd - 119;
    document.getElementById('login').style.marginTop = viezd + 'px';
}

function filtr_zaezd(viezd) {
    document.getElementById('login').style.marginTop = '-' + viezd + 'px';
    if (viezd == 119) { document.getElementById('blok').style.display = 'none'; }
}

function bookmark_down() {
    document.getElementById('bookmark').innerHTML = '<a href="javascript:;" onclick="bookmark_up();">bookmark me</a>';
    var n;
    for (n = 1; n < 21; n++) {
        setTimeout('bk_viezd(' + n + ')', n * 10);
    }
}
function bk_viezd(viezd) {
    viezd = 2 * viezd - 40;
    document.getElementById('book_block').style.marginTop = viezd + 'px';
}
function bookmark_up() {
    document.getElementById('bookmark').innerHTML = '<a href="javascript:;" onclick="bookmark_down();">bookmark me</a>';
    var n;
    for (n = 1; n < 21; n++) {
        setTimeout('bk_zaezd(' + n + ')', n * 10);
    }
}
function bk_zaezd(viezd) {
    viezd = 2 * viezd;
    document.getElementById('book_block').style.marginTop = '-' + viezd + 'px';
}