javascript settimeout() method problem

[tester000]

file.php conatians this code :

<script>
    setTimeout('done()',15000);
    function done(){window.location='file.php';}
</script>

i need to run this file.php concurrently on 3-4 times
if i do so then delay of 15 seconds is getting disturbed.
and after delay the file is displaying the incremented number which is getting displayed on each window where file is executing. BUT that number should be displayed only after 15 seconds which is not happening...

how to stop methods by conflicting???

[gits]

need to run this file.php concurrently on 3-4 times

what does that look like? 4 different windows? One Browser? what do you mean with that concurrency? where is what disturbed? do you mean that all 4 windows should be in sync?