img = new Array(
				"images/menu_1_1.gif" , "images/menu_1_2.gif",
				"images/menu_2_1.gif" , "images/menu_2_2.gif",
				"images/menu_3_1.gif" , "images/menu_3_2.gif",
				"images/menu_4_1.gif" , "images/menu_4_2.gif",
				"images/menu_5_1.gif" , "images/menu_5_2.gif"
				);
bfImg = new Array();
for(i=0; i<img.length; i++) {
	bfImg[i] = new Image();
	bfImg[i].src = img[i];
}