Adding "0" to game countdown timer?

programming flash
1

Using this script for a game countdown. Works fine but I would like to add “0” before the single digit #'s to make her look purdy.

Any help?


//the amount of time in seconds to count down from
timer = 10;
//create a new function
function countDown() {
 //subtract one from timer
timer--;
 //if timer equals zero
 if (timer == 0) {
 gotoAndStop(4);
  //clears the countInt interval
  clearInterval(countInt);
 }
}
//sets countInt to call the countDown function every 1000 milliseconds (1 second)
countInt = setInterval(countDown, 1000);