private var player_num:uint = 1;
private const max_player:uint = 3;
function Game():void{
    while(true)
    {
       switcht(player_num)
       {
          case 1:
             trace("ходит первый игрок");
          break;
          case 2:
             trace("ходит второй игрок");
          break;
          case 3:
             trace("ходит третий игрок");
          break;
       }
       player_num ++;
      if(player_num >max_player)
      {
         player_num  = 1;
      }
    }
}