/**
 * Display ads from Adsys
 *
 * @param string sAdsURL The base URL from Adsys to pull ad data from
 * @param string sDomain The domain name for the given suite of ads
 * @param array aAdSet The ads to be displayed
 *
 * @access public
 */
function displayAd(sAdsURL, sDomain, aAdSet)
{
   var adNumber = null;
   var adLink = "";
   var nUsed = 0;
   var aAds = new Array();
   var sSubURL = sAdsURL;

   // Create the "superglobal" adsys array

   if (!document.adsys) {
      document.adsys = new Array();
   }

   // Remove "duplicate" ads

   for(nUsed = 0; nUsed < aAdSet.length; nUsed++) {
   	  if (!document.adsys[aAdSet[nUsed][1]]) {
   	  	aAds[aAds.length] = aAdSet[nUsed];
   	  }
   }

   // Randomly find an ad

   if (aAds.length == 0) {
      document.write("<!-- Error: No ads assigned to position; problem with javascript file creation -->");
      return;
   } else if (aAds.length == 1) {
      adNumber = 0;
   } else {
      adNumber = Math.floor(Math.random()*aAds.length);
   }
   
   // Ad the adNumber to the list of ads we've seen
   
   document.adsys[aAds[adNumber][1]] = 1;
   
   // Assign the "base" URI for all operations
   
   sAdsURL += "/" + Math.floor(Math.random()*100000000000000);
   
   // Build the URL for retrieving the ad element
   
   sAdsURL += "/creative/" + sDomain + "/" + aAds[adNumber][0];
   sAdsURL += "/" + aAds[adNumber][1] + "." + aAds[adNumber][2];
   
   // Determine which "type" of ad we are going to render
   
   switch(aAds[adNumber][2]) {
   
       // For Flash files, build the following <object> tags
   
       case "swf":
          if (aAds[adNumber][5] != '') {
              sSubURL += "/" + Math.floor(Math.random()*100000000000000);
              
              // Build the URL for retrieving the ad element
              
              sSubURL += "/creative/" + sDomain + "/" + aAds[adNumber][6];
              sSubURL += "/" + aAds[adNumber][1] + "." + aAds[adNumber][2];
              
              sAdsURL += "?clickTAG=" + sSubURL + "%3Fr%3D" + aAds[adNumber][5];
          }
          
          adLink = '<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" ';
          adLink += 'codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0" ';
          adLink += 'width="' + aAds[adNumber][3] + '" height="' + aAds[adNumber][4];
          adLink += '" name="' + aAds[adNumber][1] + '" id="' + aAds[adNumber][1] + '">';
          adLink += '<param name="play" value="true">';
          adLink += '<param name="movie" value="' + sAdsURL + '" />';
          adLink += '<param name="quality" value="high" />';
          adLink += '<param name="wmode" value="opaque" />';
          adLink += '<embed src="' + sAdsURL + '" quality="high" ';
          adLink += 'wmode="opaque" ';
          adLink += 'width="' + aAds[adNumber][3] + '" height="' + aAds[adNumber][4];
          adLink += '" name="' + aAds[adNumber][1];
          adLink += '" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer">';
          adLink += '</embed>';
          adLink += '</object>';
          break;
      
      // Format a javascript file URL for text-based ads
      
      case "js":
          adLink = '<scr'+'ipt type="text/javascript" src="' + sAdsURL + '">';
          adLink += '</scr'+'ipt>';
          break;
         
      // The default is to assume image-style servering
         
      default:
          if (aAds[adNumber][3] != "") {
            if (aAds[adNumber][3].substring(0,7) == "mailto:") {
                adLink = '<a href="' + aAds[adNumber][3] + '">';
            } else {
                adLink = '<a href="' + sAdsURL + '?r=' + aAds[adNumber][3] + '"';
                if (aAds[adNumber][4] == "1") {
                   adLink += ' target="_blank"';
                }
                adLink += '>';
            }
         }

         adLink += '<img border="0" src="' + sAdsURL + '" />';

         if (aAds[adNumber][3] != "") {
            adLink += '</a>';
         }
   }
   
   document.write(adLink);
}aAds = new Array();
aAds[0] = new Array();
aAds[0][0] = 'header';
aAds[0][1] = '33704';
aAds[0][2] = 'gif';
aAds[0][3] = 'http://www.missoulian.com/real_estate/';
aAds[0][4] = '0';
displayAd('http://adsys.townnews.com', 'missoulian.com', aAds);