[ruslan_mart]

Bond, думаю, вот так лучше будет:

var Bullet = (function() {
	function Bullet() {
		this.element = document.getElementById('transline');
		this.bullet = document.createElement('li');
		this.left = 0;
		this._play = this.play.bind(this);
		this.element.appendChild(this.bullet);
	}
	Bullet.prototype.play = function() {
		this.left += 4;
		this.bullet.style.left = this.left + 'px';
		if(this.left >= 1000) {
			this.remove();
		}
		else {
			this._timeoutID = setTimeout(this._play, 10);
		}
	};
	Bullet.prototype.remove = function() {
		this.stop();
		this.bullet.remove();
	};
	Bullet.prototype.restart = function() {
		this.stop();
		this.play();
	},
	Bullet.prototype.stop = function() {
		this.left = 0;
		clearTimeout(this._timeoutID);
	};
	return Bullet;
}());

var bullet = new Bullet;
bullet.play();