// JavaScript Document
function wechsel()
{
 bild= new Array("top01","top02","top03","top04","top05","top06","top07","top08","top09","top10","top11","top12","top13","top14","top15","top16","top17","top18","top19","top20","top21","top22","top23","top24","top25")
 zahl1="";
 for(i=0;i<1;i++)
  {
   x=parseInt(Math.random()*25);
   zahl1+=bild[x];
  }
 	document.getElementById("oben").style.backgroundImage = "url(http://firmenlauf-dresden.de/images/top/"+zahl1+".jpg)";
}