(function(a) {
    a.fn.parallax = function(b) {
        var b = a.extend({
            useHTML: true,
            elements: []
        }, b || {});
        a((b.useHTML) ? "html" : this).bind('mousemove',(function(k) {
            var g = a(this);
            var d = {
                x: Math.floor(parseInt(g.width()) / 2),
                y: Math.floor(parseInt(g.height()) / 2)
            };
            var l = {
                x: (k.pageX - g.offset().left),
                y: (k.pageY - g.offset().top)
            };
            var h = {
                x: (l.x - d.x),
                y: (l.y - d.y)
            };
            for (var j = b.elements.length - 1; j >= 0; j--) {
                var c = {},
                    m, f;
                for (var n in b.elements[j].properties.x) {
                    f = b.elements[j].properties.x[n];
                    m = f.initial + (h.x * f.multiplier);
                    if ("min" in f && m < f.min) {
                        m = f.min
                    } else {
                        if ("max" in f && m > f.max) {
                            m = f.max
                        }
                    }
                    if ("invert" in f && f.invert) {
                        m = -(m)
                    }
                    if (!("unit" in f)) {
                        f.unit = "px"
                    }
                    c[n] = m + f.unit
                }
                for (var n in b.elements[j].properties.y) {
                    f = b.elements[j].properties.y[n];
                    m = f.initial + (h.y * f.multiplier);
                    if ("min" in f && m < f.min) {
                        m = f.min
                    } else {
                        if ("max" in f && m > f.max) {
                            m = f.max
                        }
                    }
                    if ("invert" in f && f.invert) {
                        m = -(m)
                    }
                    if (!("unit" in f)) {
                        f.unit = "px"
                    }
                    c[n] = m + f.unit
                }
                if ("background-position-x" in c || "background-position-y" in c) {
                    c["background-position"] = "" + (("background-position-x" in c) ? c["background-position-x"] : "0px") + " " + (("background-position-y" in c) ? c["background-position-y"] : "0px");
                    delete c["background-position-x"];
                    delete c["background-position-y"]
                }
                a(b.elements[j].selector).css(c)
            }
        }))
    }
})(jQuery);