var inter=5000;
ids=Array();
bannum=0;
function bannerss(){
divs=document.getElementsByTagName("div").length;
a=0;
for(i=0; i < divs; i++){
  if(document.getElementsByTagName("div")[i].className=="banner" ||
document.getElementsByTagName("div")[i].className=="banner2"){
   ids[a]=document.getElementsByTagName("div")[i].id;
   a++;
  }

}
beginnen();
}
function beginnen(){

nu=new Date();
getal=nu.getTime();
random=getal%ids.length;
for(i=0; i < ids.length; i++){
document.getElementById(ids[i]).className="banner";
}
document.getElementById(ids[random]).className="banner2";

setTimeout("roteer()",inter);
}
function roteer(){

for(i=0; i < ids.length; i++){
document.getElementById(ids[i]).className="banner";
}

document.getElementById(ids[bannum]).className="banner2";
bannum++;
if(bannum==ids.length){
bannum=0;
}
setTimeout("roteer()",inter);


}