function Zufall()
 {
 max = 2
 today = new Date();
 num = today.getTime();
 num = Math.round (Math.abs (Math.sin (num) * 100000)) % max;
 return num;
 }

function Zufallsbild_r()
{
 a = Zufall();
 document.write('<img src = cms/upload/start_r/' +a+ '.jpg>');
}