if (document.getElementById) { window.onload = swap };
function swap() {
var numimages=12;
rndimg = new Array("/files/images/banner/cesag-headerbild-01.jpg", "/files/images/banner/cesag-headerbild-02.jpg",  "/files/images/banner/cesag-headerbild-03.jpg",  "/files/images/banner/cesag-headerbild-04.jpg",  "/files/images/banner/cesag-headerbild-05.jpg",  "/files/images/banner/cesag-headerbild-06.jpg",  "/files/images/banner/cesag-headerbild-07.jpg",  "/files/images/banner/cesag-headerbild-08.jpg",  "/files/images/banner/cesag-headerbild-09.jpg",  "/files/images/banner/cesag-headerbild-10.jpg",  "/files/images/banner/cesag-headerbild-11.jpg",  "/files/images/banner/cesag-headerbild-12.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("banner").style.backgroundImage = "url("+ randomimage +")"; 
}