Button Weiterleitung

<form action="deinesite.php" method="post" name="sform">
<input class="input" type="submit" name="submitbtn" value="Akzeptieren" /></p>
</form>
<script type="text/javascript">
<!--
var secs = 10;
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>
</form>