var inputs = $("#tb_Content input");    $("#tb_Content input").keydown(function (event) {        if("[13][38][40]".indexOf("["+event.keyCode+"]")>-1){ if (event.target.type == "submit" && event.keyCode == 13)                return;            var index = 0;            for (; index < inputs.length; index++)                if ($(inputs[index]).attr("id") == event.target.id)                    break;            switch (event.keyCode) {                case 13: //回车键                case 40: //下                     index++;                    break;                case 38: //上                       index--;                    break;            }            if (index == inputs.length)                index = 0;            if (index < 0)                index = inputs.length - 1;            $(inputs[index]).focus();            return false;        }    });