var image="";
var banners=0;
function cycle() {
  if (++banners > 4) banners=1;
    loadbanners();
    document.banner1.src = image;
    window.setTimeout('cycle();',4000);
  }
  
  <!-- city image banner -->
function loadbanners() {
   if (banners==1)
      {
      image="images/events_header_lg.jpg";
      }
   if (banners==2)
      {
      image="images/why_join_header_lg.jpg";
      }
 if (banners==3)
      {
      image="images/greater_city_of_sudbury.jpg";
      }
if (banners==4)
      {
      image="images/publications_header_lg.jpg";
      }
}
 
var image2="";
var banners2=0;
function cycle2() {
  if (++banners2 > 5) banners2=1;
    loadbanners2();
    document.banner2.src = image2;
    window.setTimeout('cycle2();',4000);
  }
  
  <!-- rotating image banner -->
function loadbanners2() {
 
   if (banners2==1)
      {
      image2="images/GolfTournamentBanner.jpg";
      }if (banners2==2)
      {
      image2="images/eastlink_banner.jpg";
      }
 
   if (banners2==3)
      {
      image2="images/affinity_banner.jpg";
      }
   if (banners2==4)
      {
      image2="images/Media_Partner_Logo_Banner.jpg";
      }
	if (banners2==5)
      {
      image2="images/MentorshipProgramBannerAd.jpg";
      }
}
<!-- links for rotating banner -->
var link = "sponsor.php"
function urlswitch() {
if (banners2==1)
{
link = "http://memberservices.membee.com/onsudcoc/irmevents.aspx?id=293";
}
if (banners2==2)
{
link = "http://www.eastlink.ca";
}
 
if (banners2==3)
{
link = "affinity.php";
}
if (banners2==4)
{
link = "";
}
if (banners2==5)
{
link = "";
}
return link;
}