JS Countdown

Code:

<script type="text/javascript">
function countdown() {
    var counter = document.getElementById('yourID'); //replace with your ID
    if (parseInt(counter.innerHTML)==1) {
        location.href = 'index.php';
    }
    counter.innerHTML = parseInt(counter.innerHTML)-1;
}
setInterval(function(){ countdown(); },1000);
</script>


Use:

<font id="yourID">10</font>