Javascript Countdown Timer Code and Script Tutorial Guide Javascript Timer

<p>This simple tutorial code is to show you how javascript can help you display a simple timer, you can get more complicated even if you want to display dates.</p>
<h1 align="center">
<script language="JavaScript">
var countDownInterval=5;
var countDownTime=countDownInterval+1;
function countDown(){
countDownTime--;
if (countDownTime <=0){
countDownTime=countDownInterval;
clearTimeout(counter)
window.location="http://www.wallpaperama.com";
return
}
if (document.all) //if IE 4+
document.all.countDownText.innerText = countDownTime+" ";
else if (document.getElementById) //else if NS6+
document.getElementById("countDownText").innerHTML=countDownTime+" "
else if (document.layers){ //CHANGE TEXT BELOW TO YOUR OWN
document.c_reload.document.c_reload2.document.write('Launching in <b id="countDownText">'+countDownTime+' </b> seconds')
document.c_reload.document.c_reload2.document.close()
}
counter=setTimeout("countDown()", 1000);
}

function startit(){
if (document.all||document.getElementById) //CHANGE TEXT BELOW TO YOUR OWN
document.write('Launching in <b id="countDownText">'+countDownTime+' </b> seconds')
countDown()
}

if (document.all||document.getElementById)
startit()
else
window.onload=startit
setTimeout("location.href='http://www.wallpaperama.com'" , t)
</script>
</h1>
<p align="left">HELP! - If you've found this script helpful, we would appreciate a link to wallpaperama.com. Linking to wallpaperama will make script like this more available to poeple who are looking for help, just like you. Thanks </p>
<p align="center">Script Code at <a href="http://www.wallpaperama.com">Wallpaperama.com </a></p>