function getBannerID(){
 //ids taken from affiliatewindow.com
 var bannerIDs = new Array ("167971","167972","167973","167974", "167975", "167976", "167977", "167978", "167979","167981","167982", "167983", "167984", "167985", "167986");
 var randValue = Math.floor(Math.random() * bannerIDs.length);
 return(bannerIDs[randValue]);
}

document.write("<script src=\"http://www.awin1.com/wshow.js?s=" + getBannerID() +"\"></script>");