function preload () {
	var img1 = new Image();
	img1.src = 'images/l2_01.jpg';
	var img2 = new Image();
	img2.src = 'images/l2_02.jpg';
	var img3 = new Image();
	img3.src = 'images/l2_03.jpg';
	var img4 = new Image();
	img4.src = 'images/l2_04.jpg';
	var img5 = new Image();
	img5.src = 'images/l2_05.jpg';
	var img6 = new Image();
	img6.src = 'images/l2_06.jpg';
	var img7 = new Image();
	img7.src = 'images/l2_07.jpg';
}