// set global variables
var myWIDTH='728';
var myHEIGHT='90';
var myTARGET='_blank'
var imageURL = '';
var clickURL = '';

var bannerHREFS = new Array(
   "http://www.mb01.com/lnk.asp?o=3601&c=45372&a=2043",
   "http://www.mb01.com/lnk.asp?o=3465&c=44277&a=2043",
   "http://www.mb01.com/lnk.asp?o=3355&c=43297&a=2043",
   "http://www.mb01.com/lnk.asp?o=2882&c=39142&a=2043"
)

var bannerIMGS = new Array(
   "http://www.mb01.com/getimage.asp?m=1856&o=3601&i=45372.dat",
   "http://www.mb01.com/getimage.asp?m=1753&o=3465&i=44277.dat",
   "http://www.mb01.com/getimage.asp?m=79&o=3355&i=43297.dat",
   "http://www.mb01.com/getimage.asp?m=79&o=2882&i=39142.dat"
)

// get total number of ads
var numberAds=bannerHREFS.length;

// get random number
var randNum = randomNumber();

// output random ad
document.write('<a href="'+bannerHREFS[randNum]+'" target="'+myTARGET+'"><img src="'+bannerIMGS[randNum]+'" width='+myWIDTH+' height='+myHEIGHT+' alt="Click here" border="0"></a>');

function randomNumber() {
  return Math.round(Math.random()*numberAds-0.5);
}