javascript countdown

<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><script language="Javascript">
<!--
var iCounter = 30;
function countdown()
{
if (iCounter > 0)
{
iCounter--;
document.getElementById('counter').innerHTML = iCounter;
setTimeout("countdown()",1000);
}else
window.location.reload();
}
window.onload = countdown;
//-->
</script>automatischer Relaod in: </p>
<h5>&nbsp;</h5>
<p>&nbsp;</p>
<p><script> document.write("<b><span ID='counter'></span></b> - Sekunden")</script></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><script language="Javascript">
<!--
var iCounter = 30;
function countdown()