Banner skift i JavaScript

<script language="JavaScript">
var imgs1 = new Array("banner1.gif","banner2.gif","banner3.gif","banner4.gif","banner5.gif")
var lnks1 = new Array("link1.html","link2.html","link3.html","link4.html","link5.html")
var alt1 = new Array()
var currentAd1 = 0
var imgCt1 = 5
function cycle1() {
  if (currentAd1 == imgCt1) {
    currentAd1 = 0
  }
var banner1 = document.getElementById('adBanner1');
var link1 = document.getElementById('adLink1');
  banner1.src=imgs1[currentAd1]
  banner1.alt=alt1[currentAd1]
  document.getElementById('adLink1').href=lnks1[currentAd1]
  currentAd1++
}
  window.setInterval("cycle1()",60000)
</script>
<a href="link1.html" id="adLink1" target="_top">
<img src="banner1.gif" id="adBanner1" border="0" width="468" height="60"></a>

<script language="JavaScript">
var imgs1 = new Array("banner1.gif","banner2.gif","banner3.gif","banner4.gif","banner5.gif")

var currentAd1 = 0
var imgCt1 = 5
function cycle1() {
  if (currentAd1 == imgCt1) {
    currentAd1 = 0
  }
var banner1 = document.getElementById('adBanner1');

    banner1.src=imgs1[currentAd1]

  currentAd1++
}
  window.setInterval("cycle1()",60000)
</script>

<img src="banner1.gif" id="adBanner1" border="0" width="468" height="60">