var list= new Array()
  list[list.length]='images/ads/londis.gif';
  list[list.length]='images/ads/plas.gif';
  list[list.length]='images/ads/plo.gif';
  list[list.length]='images/ads/travel.gif';
  list[list.length]='images/ads/trump.gif';
  list[list.length]='images/ads/Untitled-7.gif';
  j=parseInt(Math.random()*list.length);
  j=(isNaN(j))?0:j;
  document.write("<img alt='Advertisement' src='"+list[j]+"' />");