chg1 = new Image();
chg2 = new Image();
chg3 = new Image();
chg4 = new Image();
chg5 = new Image();
chg6 = new Image();

bk1 = new Image();

chg1.src = "images/img1.jpg";
chg2.src = "images/img2.jpg";
chg3.src = "images/img3.jpg";
chg4.src = "images/img4.jpg";
chg5.src = "images/img5.jpg";
chg6.src = "images/img6.jpg";

bk1.src = "images/3.jpg";