var myBgs = new Array();
 myBgs[0] = "http://www.kb.dk/da/dia/studentsonly/img/bg01.jpg";
 myBgs[1] = "http://www.kb.dk/da/dia/studentsonly/img/bg02.jpg";
 myBgs[2] = "http://www.kb.dk/da/dia/studentsonly/img/bg03.jpg";
 
  
 
function setBg(){
 var rand_no = Math.random();
 rand_no = rand_no * 3;
 rand_no = Math.ceil(rand_no);
 rand_no--;
 
 var body = document.getElementsByTagName('body').item(0);
 body.style.backgroundImage = 'url('+myBgs[rand_no]+')';   
  
}
 
function init(){
  startList();
  setBg();
}
 

window.onload=startList;