var urlArray = new Array(5); //for URL's, increase size as necessary
var banArray = new Array(5); //for banners, increase size as necessary
var counter = 1;
var url = ""; //initial URL

//add your necessary URL's
urlArray[0] = "";
urlArray[1] = "";
urlArray[2] = "";
urlArray[3] = "";
urlArray[4] = "";

if(document.images) //pre-load all banner images
{
  for(i = 0; i < 5; i++)
  {
    banArray[i] = new Image(350, 50);
    banArray[i].src = "images/topbanners/ban_" + (i+1) + ".gif";
  }
}


function changeBanner() //banner changer function
{
  if(counter > 4)
   counter = 0;

  document.banner.src = banArray[counter].src; //sets a new banner

  url = urlArray[counter]; //sets a new URL to the banner
  counter++; //increase the counter for the next banner
}

//calls the changeBanner() function every 3 seconds
//change the timer as necessary (minutes * 60000) or (seconds * 1000)
var timer = window.setInterval("changeBanner()", 6000);