(function($) {
    $.fn.exchange = function(options) {
        var defaults = {
    };
    var options = $.extend(defaults, options);
    (readCookie('css')) ? exchangeCSS(readCookie('css')) : "";

    return this.each(function() {
        obj = $(this);
        $("#exchanger").css({ "display": "block" });
        //click event on change css buttons


        var cssType = 1;

        $("#exchanger #changeCSS").click(function() {
            if (cssType == 1) {
                cssType = 2;
                $("#exchanger #changeCSS").html("Обычная версия");
            } else {
            cssType = 1;
            $("#exchanger #changeCSS").html("Контрастная версия");
            }
            exchangeCSS("css" + cssType);
        });

        



    });

    function createCookie(name, value, days) {
        if (days) {
            var date = new Date();
            date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
            var expires = "; expires=" + date.toGMTString();
        }
        else var expires = "";
        document.cookie = name + "=" + value + expires + "; path=/";
    }
    function readCookie(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    }
    function exchangeCSS(css) {
        $('link').each(function() {
            var _link = $(this);
            _link.attr("disabled", true);
            (_link.attr('title') == css) ? _link.attr("disabled", false) : "";
        });
        createCookie('css', css, 365);
    }

};
})(jQuery);