var intNumAds = 1;
  var urlLoc = "http://store.yahoo.com/lib/homerunexpress/";
  var imgFile = new Array;
    imgFile[1]="ad-shipping.jpg";
  var linkName = new Array;
    linkName[1] = "freshiponmos.html";
  intRand = Math.floor(Math.random()*(intNumAds-1))+1;
  document.write("<a href='"+linkName[intRand]+"'><img src='"+urlLoc+imgFile[intRand]+"' border=0></a>");