本不想回答了
但还是觉得应该帮你一下的
var   = 50;
rbListener = new Object();
rbListener。click = function(evt) {
rbNum = evt。target。selection。
  data;
trace(rbNum);
};
radioGroup。addEventListener("click", rbListener);
var   = true;
this。stop_btn。enabled = false;
this。
  pause_btn。enabled = false;
this。start_btn。onRelease = function() {
this。_parent。pause_btn。enabled = true;
this。_parent。
  stop_btn。enabled = true;
this。enabled = false;
this。_parent。a_rb。enabled = false;
this。_parent。b_rb。enabled = false;
var   = rbNum;
function time_func() {
  if (timeB == true) {
   var   = "0"+int(Num/60)+":";
   if (Num%60<10) {
    var   = "0"+Num%60;
   } else {
    var   = Num%60+"";
   }
   time_txt。
  text = "剩余时间："+fen+miao;
   Num--;
  }
  if (Num<0) {
   start_btn。enabled = true;
   time_txt。text = "时间到!";
   clearInterval(ID);
   Num = rbNum;
   timeB = true;
   a_rb。
  enabled = true;
   b_rb。enabled = true;
  }
}
time_func();
ID = setInterval(time_func, 1000);
};
this。pause_btn。onRelease = function() {
if (timeB == true) {
  timeB = false;
} else {
  timeB = true;
}
};
this。
  stop_btn。onRelease = function() {
this。enabled = false;
this。_parent。pause_btn。enabled = false;
clearInterval(ID);
start_btn。
  enabled = true;
Num = rbNum;
timeB = true;
a_rb。enabled = true;
b_rb。enabled = true;
time_txt。text = "计时停止!";
}; 
。