Code:
$footer
<script type="text/javascript">
<!--
var secs = 10;var wait = secs * 1000;document.registerfield.registertimer.disabled=true;for(i=1;i<=secs;i++) {window.setTimeout("update(" + i + ")", i * 1000);}window.setTimeout("timer()", wait);function update(num) {if(num == (wait/1000)) {document.registerfield.registertimer.value = "$vbphrase[register]";}else {printnr = (wait/1000)-num;document.registerfield.registertimer.value = "$vbphrase[register](" + printnr + ")";}}function timer(){document.registerfield.registertimer.disabled=false;}
//-->
</script>