// From: http://www.webdeveloper.com/forum/showthread.php?t=220013

var links = ["services/index.php?page=webdesign",
			 "hotspot/preap/papcom.php",
			 "internet/index.php?page=wifi",
			 ""]; // link addresses
var targets = ["_parent",
			   "_parent",
			   "_parent",
			   "_parent"]; // target addresses
var imgs = ["images/banners/global.gif",
			"images/banners/internet.gif",
			"images/banners/wifi.gif",
			"images/banners/referafriend.gif"]; // link images
var img = []; // preloading array
var timeBasis = 5000; // in milli-seconds

// preload images
for(i=0; i<imgs.length; i++) { img[i] = new Image();  img[i].src = imgs[i]; }

var imgPtr = 0;

function updateAd(amt){
  if (amt == 0) { imgPtr++; } else { imgPtr += amt; }
  if (imgPtr < 0) { imgPtr = links.length-1; }
  if (imgPtr > links.length-1) { imgPtr = 0; }
// for testing purposes only
//  document.getElementById('temp').innerHTML = 'imgPtr: '+imgPtr+'<br>amt: '+amt+'<br>img.src:'+img[imgPtr].src;

  document.getElementById('myAd').href = links[imgPtr];
  document.getElementById('myAd').target = targets[imgPtr];
  document.getElementById('myAd').title = links[imgPtr];
  document.getElementById('myAdImg').src = img[imgPtr].src;
  document.getElementById('myAdImg').alt = img[imgPtr].src;
}

window.onload = function() {setInterval("updateAd(0)", timeBasis)}