var imgs = ['../images/layout/menu-bg2.png', '../images/layout/menu-bg3.png', '../images/layout/menu2-hover.jpg', '../images/layout/menu1-hover-menu2-aktiv.jpg', '../images/layout/menu3-head.jpg', '../images/layout/menu3-hover.jpg', '../images/layout/menu3-aktiv.jpg'];
var imgsLen = imgs.length;
cache = [];
for (var i = 0; i < imgsLen; i++) {
    cache[i] = new Image();
    cache[i].src = imgs[i];
}