var links = ["webdesign.php", "webdesign.php", "webdesign.php"]; 
var imgs = ["images/Project_wedding.gif", "images/fanwest2s.gif", "images/Project_kpl.gif"]; 
var text = [ "<b>Joy and Paul Hawkins Wedding</b>  - <b>ONLINE PHOTO ALBUM</b>: Flash wedding album, with background music, and downloadable photos&nbsp;&nbsp;<b>COMPLETED </b><br><br> " , "<b>The Game They Play</b> - <b>SHORT FILM</b> : co-produced Olaf Olgiati's Fantasy Western   - <b>COMPLETED</b><br><br> ", "<b>Kenwick Park Lodge</b>  - <b>WEBSITE</b>: Holiday Home Website and Booking Form.  <b>COMPLETED </b><br><br>" ];
var img = [];
var len = (links.length + imgs.length) / 2; 

  for(i=0; i<imgs.length; i++){
   img[i] = new Image();
   img[i].src = imgs[i];
  }
 
function showAd(){
 if(len%2== 0){
	 document.write('<img src="blank.gif" alt="">');
     return false;
    }
 var rand = Math.floor(len*Math.random());
 document.write('<center><a href="'+links[rand]+'" title="View further details at  '+links[rand]+'" id="myAd">');
 document.write('<img src="'+img[rand].src+'" alt="View further details at '+links[rand]+'" name="myAdImg" align="center"></a></center>');
 document.write('<br>' +text[rand]+'');
  window.onload = function() {("updateAd()" )};
}

function updateAd(){
 var r = Math.floor(len*Math.random());
  if(!document.links) return false;
   for(i=0; i<document.links.length; i++){
	 if(document.links[i].id == "myAd"){
	  if(document.links[i].href != links[r]){
	     document.links[i].href = links[r];
	     document.images['myAdImg'].src = img[r].src;
      } else {
         updateAd();
      }
     }
   }
}