loadElements: function (a) {
            var b, c = Math.min(this.num, 2 * this.options.preloadRange + 1), d = a;
            for (b = 0; c > b; b += 1)d += b * (0 === b % 2 ? -1 : 1), d = this.circle(d), this.loadElement(d)
        },