var banArray = new Array(4); //for banners, increase size as necessary
var counter = 1;
var url = "http://javascript.internet.com"; //initial URL


if(document.images) //pre-load all banner images
{
  for(i = 0; i < 4; i++)
  {
    banArray[i] = new Image(600, 72);
    banArray[i].src = "images/gift" + (i+1) + ".jpg";
  }
}


function changeBanner() //banner changer function
{
  if(counter > 3)
   counter = 0;

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

  counter++; //increase the counter for the next banner
}

//calls the changeBanner() function every 4 seconds
//change the timer as necessary (minutes * 60000) or (seconds * 1000)

var timer = window.setInterval("changeBanner()", 2500);