Preload Images
var image0 = new Image(); image0.src = "images/lay/banner-links-1.png";
var image1 = new Image(); image1.src = "images/lay/schatten-1.png";
var image2 = new Image(); image2.src = "images/lay/banner-rechts-1.png";
var image3 = new Image(); image3.src = "images/lay/nofly-banner-rechts-1.png";