setTimeout(function(){
//Here should be all the code you want executed
}, 0);

<script type='text/javascript'> 
<!-- 
 
 var milisec=0;
 var seconds=<?php echo $s;?>;
 // I directed this (document.counter.d2.value='0';) to setTimeout, as the document has not yet been loaded
 
function display(){ 
 if (milisec <= 0){ 
    milisec = 9;
    seconds -= 1; 
 } 
 if (seconds <= -1){ 
    milisec = 0;
    seconds += 1;
 } else {
    milisec-=1;
    document.counter.d2.value=seconds;
    setTimeout(function(){ display(); },100);
 }
} 
window.onload=function() {
document.counter.d2.value='0';
display();
}
--> 
</script>

<?php
 
session_start();
 
 
$f=$_GET['f'];
$dlpath=urlencode($_GET['dlpath']);
 
$s=waitfor(); //function returns how many seconds to wait.
$link='<a href="http://mintload.com/dl/launchdl.php?f='.$f.'&dlpath='.$dlpath.'&sessid='.$sessid.'" target="_blank"><img width=195 height=45 src="http://mintload.com/images/btn_download.png" alt="Download!" border=0></a>';
 
global $zerowait;
$zerowait=md5("secret_password".session_id()); //temperory session-id based password (hash) instructing that seconds to wait is 0.
 
if($_GET['s']!=$zerowait)
{
//Display seconds, and after $s seconds (returned by func) , refresh the page.
header("refresh: $s; http://mintload.com/dl/timer3.php?s=".$zerowait."&f=$f&dlpath=$dlpath&sessid=$sessid");
echo '<form name="counter"><input type="text" size="8" style="font-size:72pt; border:none; font-family:Verdana; color:#00BFFF; text-outline: 1px 1px #009ACD;" name="d2"></form>';
 
}
else {
//if $s=-zerowait, set seconds to 0 (stops javascript timer), display "download" button ($link), and exit rest of script
 
$s=(int)0;
echo $link;
exit;
}
 
echo "
 
<script> 
<!-- 
// 
 var milisec=0 
 var seconds=$s
 document.counter.d2.value='0' 
 
function display(){ 
 if (milisec<=0){ 
    milisec=9 
    seconds-=1 
 } 
 if (seconds<=-1){ 
    milisec=0 
    seconds+=1 
 } 
 else 
    milisec-=1 
    document.counter.d2.value=seconds
    setTimeout(\"display()\",100) 
} 
display() 
--> 
</script>"; 
 
 
function waitfor() {
 
//Code suppressed as it works fine (waitfor())
 
/* Basically what function does is:  
if premium user, $s=0;
if free users, $s=30;
if unregistered user, $s=45;
return $s;
*/
 
} //func ends
 
?>