Fire too quick

1

I press space bar to launch some missiles up the screen.
My code works it is just I cant fire 1 missile at a time because pressing space bar to fire , then 2-3 missiles go at once.
//main


I press space bar to launch some missiles up the screen.
My code works it is just I cant fire 1 missile at a time because pressing space bar to fire , then 2-3 missiles go at once.
//main
  if (dict[Keyboard.SPACE]==true  ) {
 myplayer.firemissile(mybackList); 
  }
//player
public function firemissile(mybackList:Array)
  {
      
   
for each (var el:ClassMissile    in myMissileList) {
 if (el.fire ==false){
 el.startMissile (_x,(_y+_height));
 trace("fire" + el.No );
 break;
       }
    }
      
   
  }
//missile class
public function startMissile(sx:int,sy:int)
   {
   //trace("smssile2");
   img1.visible =true;
   _x=sx;
   _y=sy;
   img1.y=posY(_y);
   img1.x=_x;
   _fire=true;
   
    
  }