// JavaScript Document
if (document.getElementById) { window.onload = swap };

function swap() {
var numimages=5;
rndimg = new Array("/includes/images/scjs_bg_foto_wissel_a.jpg","/includes/images/scjs_bg_foto_wissel_b.jpg","/includes/images/scjs_bg_foto_wissel_c.jpg","/includes/images/scjs_bg_foto_wissel_d.jpg","/includes/images/scjs_bg_foto_wissel_e.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("foto_wissel").style.backgroundImage = "url("+ randomimage +")"; 
}