大小图轮播

            var play;
            if(!play){
                //大小图轮播
                var sWidth = $(".briefing .briefingLive").width();
                var lens = $(".liveBigImg li").length;
                var indexs = 0;
                var liLens = (100 / lens) + "%";

                $(".liveBigImg li").css("width", liLens);
                $(".briefingRight ul li").css({

                }).mouseenter(function() {
                    indexs = $(".briefingRight ul li").index(this);
                    showPics(indexs);
                }).eq(0).trigger("mouseenter");
                $(".liveBigImg").css("width", sWidth * (lens));

            }

            function showPics(indexs) {
                var nowLeft = -indexs * sWidth;
                $(".liveBigImg").stop(true, false).animate({
                    "left": nowLeft
                }, 500);
                $(".briefingRight ul li").removeClass("focus").eq(indexs).addClass("focus");
            }