gistfile1.txt

    function do_later () {

      var args = arguments,
          callback,
          timeout;

      if(args.length < 2) {
        throw new Error("Function do_later requires at least two arguments, " + args.length + " given");
      }

      for(i = 0, len = args.length; i < len; i++) {
        if(typeof args[i] == 'function') {
          callback = args[i];
        }

        if(typeof args[i] == 'number') {
          timeout = args[i];
        }
      }

      if(callback && timeout) {
        window.setTimeout(callback, timeout);
      }
    }