var z= 3;
Banner = new Array(z);

Banner[0] = '<a href="http://www.amidalla.com/pp_aff/pp_aff_template.php?aff=ehunting@webtoady.com"><img src="http://www.amidalla.com/pp_aff/banner/aws_468_60_an.gif"></a>';
Banner[1] = '<a href="http://www.netflip.com/nf/sb/dl?v=1&w=32241021&x=234&y=60&t=S&n=1002"><img src="http://www.netflip.com/nf/sb/di?v=1&w=32241021&x=234&y=60&t=s&n=1002"></a>';
Banner[2] = '<a href="http://clickserve.cc-dt.com/link/click?lid=41000000005857304"><img src="http://clickserve.cc-dt.com/link/banner?lid=41000000005857304"></a>';

var jetzt=new Date();
var z=(jetzt.getSeconds())%3;
document.write(Banner[z]);