/* Copyright 2011, Ben Lin (http://dreamerslab.com/)
 * Licensed under the MIT License (LICENSE.txt).
 *
 * Version: 1.0.0
 *
 * Requires: jQuery 1.2.6+
 */
$.fn.center = function (a) {
    var b = $(window),
        c = b.scrollTop();
    return this.each(function () {
        var f = $(this),
            e = $.extend({
                against: "window",
                top: false,
                topPercentage: 0.5
            }, a),
            d = function () {
                var h, g, i;
                if (e.against === "window") {
                    h = b;
                } else {
                    if (e.against === "parent") {
                        h = f.parent();
                        c = 0;
                    } else {
                        h = f.parents(against);
                        c = 0;
                    }
                }
                g = ((h.width()) - (f.outerWidth())) * 0.5;
                if (h.height() < f.outerHeight()) {
                    i = 10 + c;
                } else {
                    i = ((h.height()) - (f.outerHeight())) * e.topPercentage + c;
                }
                if (e.top) {
                    i = e.top + c;
                }
                f.css({
                    left: g,
                    top: i
                });
            };
        d();
        b.resize(d);
    });
};