function random_banner(){
  var i=0;
  banners = new Array();

  n=banners.length;
  
  today = new Date();
  i=today.getSeconds();
	index = i-Math.round((i-1)/n)*n;

	if (index<0) index=0;
	if (index>n-1) index=n-1;


  return '';
  
}