$(document).ready(function () {
    // use the custom easing (easing: 'custom',)
    $("div.scrollable").scrollable({   speed: 2500,circular: true }).navigator().autoscroll({
        interval: 4000,autopause:false
    });
});
$.easing.custom = function (x, t, b, c, d) {
    var s = 1.70158;
    if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
    return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
}