var cat_ad = 0;
  
  var cat_ad_image_srcs = new Array();
  cat_ad_image_srcs[0] = "http://www.1800petmeds.com/images/products/large/10361_160.jpg";
  cat_ad_image_srcs[1] = "http://www.1800petmeds.com/images/products/large/10461_160.jpg";
  cat_ad_image_srcs[2] = "http://www.1800petmeds.com/images/products/large/104612_160.jpg";
  
  var cat_ad_urls = new Array();
  cat_ad_urls[0] = "http://click.linksynergy.com/fs-bin/click?id=kcowBcROGIM&offerid=56753.10361&type=2&subid=0";
  cat_ad_urls[1] = "http://click.linksynergy.com/fs-bin/click?id=kcowBcROGIM&offerid=56753.10461&type=2&subid=0";
  cat_ad_urls[2] = "http://click.linksynergy.com/fs-bin/click?id=kcowBcROGIM&offerid=56753.104612&type=2&subid=0";
 
  var cat_ad_tracking_srcs = new Array();
  cat_ad_tracking_srcs[0] = "http://ad.linksynergy.com/fs-bin/show?id=kcowBcROGIM&bids=56753.10361&type=2&subid=0";
  cat_ad_tracking_srcs[1] = "http://ad.linksynergy.com/fs-bin/show?id=kcowBcROGIM&bids=56753.10461&type=2&subid=0";
  cat_ad_tracking_srcs[2] = "http://ad.linksynergy.com/fs-bin/show?id=kcowBcROGIM&bids=56753.104612&type=2&subid=0";

  var cat_ad_prices = new Array();
  cat_ad_prices[0] = "$43.99";
  cat_ad_prices[1] = "$81.99";
  cat_ad_prices[2] = "$158.98";

  var cat_ad_image = "<img id=\"cat_ad_image\" border=0 src=\"" + cat_ad_image_srcs[cat_ad] + "\" >";
  var cat_ad_url = cat_ad_urls[cat_ad];
  var cat_ad_tracking = "<img id=\"cat_ad_tracking\" border=0 width=1 height=1 src=\"" + cat_ad_tracking_srcs[cat_ad] + "\" >";
  var cat_inner_html_buy = "Buy For ";
  var cat_ad_price = cat_inner_html_buy + cat_ad_prices[cat_ad];
  var cat_ad_copy = "Frontline Plus Provides Your Cat With The Most Complete Spot-on Flea And Tick Protection. In Addition To Killing 98-100% Of Adult Fleas On Your Cat Within 24 Hours, Frontline Plus Contains A Special Ingredient That Kills Flea Eggs And Larvae, Too, And Keeps All Stages Of Fleas From Developing. By Effectively Stopping The Development Of New Fleas, Frontline Plus Completely Breaks The Flea Life Cycle. And, Frontline Plus Kills All Stages Of 4 Major Ticks Including Those That May Transmit Lyme Disease And Rocky Mountain Spotted Fever. Kills chewing lice. Use On Kittens 8 Weeks Or Older. 3 topical Monthly Treatments.";
  
  function change_cat_select()
  {
    var cat_select = document.getElementById("cat_select");
    var value = cat_select.value;
    if (!isNaN(value))
    {
      var img = document.getElementById("cat_ad_image");
      img.src = cat_ad_image_srcs[value];
      var tracking = document.getElementById("cat_ad_tracking");
      tracking.src = cat_ad_tracking_srcs[value];	
      var anchor = document.getElementById("cat_ad_url");
      anchor.href = cat_ad_urls[value];
      anchor.innerHTML = cat_inner_html_buy + cat_ad_prices[value];
    }
  }
  
  function create_cat()
  {
    document.write("<table border=\"0\">\n");
    document.write("  <tr>\n");
    document.write("    <td>" + cat_ad_image + " " + cat_ad_tracking + "</td>\n");
    document.write("    <td>" + cat_ad_copy + "</td>\n");
    document.write("  </tr>\n");
    document.write("</table>\n");

    document.write("<p align=center>\n");
    document.write("  <select id=\"cat_select\" name=\"cat_select\" onchange=\"change_cat_select()\">\n");
    document.write("    <option id=\"cat_select_0\" value=\"0\">Frontline Plus 3pk Cats & Kittens</option>\n");
    document.write("    <option id=\"cat_select_1\" value=\"1\">Frontline Plus 6pk Cats & Kittens</option>\n");
    document.write("    <option id=\"cat_select_2\" value=\"2\">Frontline Plus 12pk Cats & Kittens</option>\n");
    document.write("  </select>\n");
    document.write("</p>\n");

    document.getElementById("cat_select_" + cat_ad).selected="selected";
    document.write("<p align=center><a id=\"cat_ad_url\" href=\"" + cat_ad_url + "\" target=\"new\">" + cat_ad_price + "</a><\p>\n");
  }