adImages = new Array("Images/image1.jpg","Images/image2.jpg","Images/image3.jpg", "Images/image4.jpg", "Images/image5.jpg", "Images/image6.jpg", "Images/image7.jpg");
thisAd = 0;
imgCtr = adImages.length;

function rotate()
{
   if (document.images)
   {
      if (thisAd == imgCtr)
      {
         thisAd = 0;
      }
      document.adBanner.src=adImages[thisAd];
      thisAd++;

      setTimeout("rotate()", 5 * 1000);
   }
}