nefungujúci script

<a id="odkaz" href="https://www.facebook.com/">
  <center><img id="obrazek" src="http://www.tapetymix.sk/uploads/images/product/Fototapeta_Pr%C3%ADroda_Alpy_-_Grossglockner_10099.jpg.large.jpg" width="800" height="400" alt="Web 1" title="Web 1"></center>
</a>  
<script>
var odkazy = ["http://www.1.cz", "http://www.2.cz", "http://www.3.cz"];
var obrazky = ["http://img.isimax.cz/images/075.jpg", "http://www.tapetymix.sk/uploads/images/product/Fototapety_Pr%C3%ADroda_-_Horsk%C3%A9_jazero_325.jpg.large.jpg", "http://img.pauzicka.zoznam.sk/pictures/Priroda_23.6.jpg"];
var popisky = ["Web 1", "Web 2", "Web 3"];
var j = 0;
function vymenit()
{ 
  j = (j + 1) % odkazy.length;
  document.getElementById("odkaz").href = odkazy[j];
  document.getElementById("obrazek").src = obrazky[j];
  document.getElementById("obrazek").alt = document.getElementById("obrazek").title = popisky[j];
}
setInterval(vymenit, 5000); 
</script>