<form name=sform>
<input class="input" type="submit" name="submitbtn" value="Akzeptieren">
</form>


<script type="text/javascript">
var secs = 20;
var wait = secs * 1000;
document.sform.submitbtn.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.sform.submitbtn.value = "Akzeptieren";
}
else {
printnr = (wait/1000)-num;
document.sform.submitbtn.value = "Akzeptieren (" + printnr + ")";
}
}

function timer() {
document.sform.submitbtn.disabled=false;
}
</script>

?? & Nightfire

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