function popup()
{
window.setTimeout('popup1()',3500);
}
function popup1()
{
 do
   {
    x=Math.round(Math.random() * 30);
   }
 while (x > 2|| x < 1);

 pg='http://www.friseur-suche.de/banner/popup' + x + '.htm';
 window.open(pg,'popup','width=468,height=60,left=400,top=200');
}