//写cookies函数
        function SetCookie(name, value)//两个参数，一个是cookie的名子，一个是值
        {
            var Days = 30; //此 cookie 将被保存 30 天
            var exp = new Date();    //new Date("December 31, 9998");
            exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
            document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
        }
        function getCookie(name)//读取cookies函数       
        {
            var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
            if (arr != null) return unescape(arr[2]); return null;

        }
        function delCookie(name)//删除cookie
        {
            var exp = new Date();
            exp.setTime(exp.getTime() - 1);
            var cval = getCookie(name);
            if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
        }

$("#input_SmallImgUrl").val(getCookie("SmallImgUrl"));　　

SetCookie("sImage", $("#ImgUrl").attr("src").toString());

$("#ImgUrl").attr("src", getCookie("sImage"));