[holev]

improved it a bit:

<script>
secs = 10; // Number of secs to delay
wait = secs * 1000;
document.forms.register.Submit.disabled =true;
for(i=1;i<=(wait/1000);i++) {
	window.setTimeout("doUpdate(" + i + ")", i * 1000);
}
window.setTimeout("Timer()", wait);

function doUpdate(num) {
	if(num == (wait/1000)) {
		document.forms.register.Submit.value = "Agree";
	} else {
		wut = (wait/1000)-num;
		document.forms.register.Submit.value = "Agree (" + wut + ")";
	}
}

function Timer() {
	document.forms.register.Submit.disabled =false;
}
</script>

now it will show the user how much time is left by changing the value of the button.