function preload(){
	nav1 = new Image();
	nav1.src='images/nav-1.jpg';
	nav2 = new Image();
	nav2.src='images/nav-2r.jpg';
	nav3 = new Image();
	nav3.src='images/nav-3r.jpg';
	nav4 = new Image();
	nav4.src='images/nav-4r.jpg';
	nav5 = new Image();
	nav5.src='images/nav-5r.jpg';
	nav6 = new Image();
	nav6.src='images/nav-6r.jpg';
	nav7 = new Image();
	nav7.src='images/nav-7r.jpg';
}