function init() {
	img1 = new Image();
	img2 = new Image();
	img3 = new Image();
	img4 = new Image();
	img5 = new Image();
	img6 = new Image();
	img7 = new Image();
	img8 = new Image();
	img9 = new Image();
	img10 = new Image();
	img11 = new Image();
	img12 = new Image();
	img1.src = "images/btn_01_over.gif";
	img2.src = "images/btn_02_over.gif";
	img3.src = "images/btn_03_over.gif";
	img4.src = "images/btn_04_over.gif";
	img5.src = "images/btn_05_over.gif";
	img6.src = "images/btn_06_over.gif";
	img7.src = "images/btn_07_over.gif";
	img8.src = "images/btn_08_over.gif";
	img9.src = "images/btn_09_over.gif";
	img10.src = "images/btn_10_over.gif";
	img11.src = "images/btn_b_over.gif";
	img12.src = "images/btn_a_over.gif";
}