jQuery Parallax Effect plugin

jquery.parallax.js

/*!
 * jQuery Parallax Effect plugin v0.9
 * https://gist.github.com/2020675
 *
 * Copyright (c) 2012 Takeru Suzuki - http://terkel.jp/
 * Licensed under the MIT license - http://www.opensource.org/licenses/MIT
 */
(function (window, $) {

    $.fn.parallax = function (options) {
        var opts = $.extend({}, $.fn.parallax.defaults, options);
        return this.each(function () {
            var $this = $(this),
                $window = $(window),
                pos = $this.position(),
                left = pos.left,
                top = pos.top,
                coeffX = opts.coeffX,
                coeffY = opts.coeffY,
                didScroll = false;
            $window.bind('scroll', function () {
                didScroll = true;
            });
            setInterval(function () {
                if (didScroll) {
                    var y = $window.scrollTop();
                    $this.stop().animate({
                        left: left + y * coeffX,
                        top: top + y * coeffY
                    }, opts.duration, opts.easing);
                    didScroll = false;
                }
            }, 200);
        });
    };

    $.fn.parallax.defaults = {
        duration: 1600,
        easing: 'swing',
        coeffX: 0, // +right -left
        coeffY: -0.25 // +down -up
    };

})(window, jQuery);

jquery.parallax.min.js

/*!
 * jQuery Parallax Effect plugin v0.9
 * https://gist.github.com/2020675
 *
 * Copyright (c) 2012 Takeru Suzuki - http://terkel.jp/
 * Licensed under the MIT license - http://www.opensource.org/licenses/MIT
 */
(function(h,a){a.fn.parallax=function(c){var b=a.extend({},a.fn.parallax.defaults,c);return this.each(function(){var e=a(this),f=a(h),g=e.position(),c=g.left,i=g.top,j=b.coeffX,k=b.coeffY,d=!1;f.bind("scroll",function(){d=!0});setInterval(function(){if(d){var a=f.scrollTop();e.stop().animate({left:c+a*j,top:i+a*k},b.duration,b.easing);d=!1}},200)})};a.fn.parallax.defaults={duration:1600,easing:"swing",coeffX:0,coeffY:-0.25}})(window,jQuery);