rnd.today=new Date();
rnd.seed=rnd.today.getTime();

function rnd() {
  rnd.seed = (rnd.seed*9301+49297) % 233280;
  return rnd.seed/(233280.0);
};

function rand(number) {
  return Math.ceil(rnd()*number);
};

var number=rand(3)-1
var ads = new Array(3);
//ads[0]=['someurl','someimage'];
ads[0]=['http://www.cafepress.com/startrek','cafepress_728x90.gif'];
ads[1]=['http://www.startrek.com/startrek/view/store/video.html','dvds_728x90.gif'];
ads[2]=['http://www.startrek.com/startrek/view/store/ringtones.html','mobile_728x90.gif'];

//document.write('<div align=center><a href="'+ads[number][0]+'" target="_blank"><img src="http://www.startrek.com/html/ads/728x90/'+ads[number][1]+'" alt="click here" border="0"></a></div>');

ord=Math.random()*10000000000000000;
document.write('<div align=center><script language="JavaScript" src="http://ad.doubleclick.net/adj/banners.startrek.com/;dcopt=ist;sz=728x90;ord=' + ord + '?" type="text/javascript"><\/script></div>');