var speedSlider = 500;

(function($) {

    $(document).ready(
        function() {

            $("div.slider-content").each(
                function() {
                    var curBlock = $(this);
                    curBlock.data("curIndex", 0);
                    curBlock.find("ul").width(curBlock.find("li").length * curBlock.find("li:first").width());
                }
            );

            $("a.slider-prev").click(
                function() {
                    var curBlock = $("div.slider-content");
                    var curIndex = Number(curBlock.data("curIndex"));

                    curIndex -= 1;
                    if (curIndex < 0) {
                        curIndex = 0;
                    }
                    curBlock.data("curIndex", curIndex);

                    curBlock.find("ul").animate({"left":"-" + (curIndex * curBlock.find("li:first").width()) + "px"}, speedSlider);

                    return false;
                }
            );

            $("a.slider-next").click(
                function() {
                    var curBlock = $("div.slider-content");
                    var curIndex = Number(curBlock.data("curIndex"));

                    curIndex += 1;
                    if (curIndex == curBlock.find("li").length) {
                        curIndex = curBlock.find("li").length - 1;
                    }
                    curBlock.data("curIndex", curIndex);

                    curBlock.find("ul").animate({"left":"-" + (curIndex * curBlock.find("li:first").width()) + "px"}, speedSlider);

                    return false;
                }
            );

        }
    );

})(jQuery);