var introDelay = 1250;

var onready = function () {
    setTimeout(down, introDelay);
    $('.navtop .bt-close').click(up);
}

function up(e) {
    $('.navtop,#main').animate({
        top: "-=45px"
    });
    $('body').animate({ backgroundPosition: '50% 0' });
    e.preventDefault();
}
function down() {
    $('.navtop,#main').animate({
        top: "+=45px"
    });
    $('body').animate({ backgroundPosition: '50% 45px' });
}

//$(onready);