This goes into your main page.
Code:
<script type="text/javascript">
(function() { var rts = document.createElement('script'); rts.type = 'text/javascript'; rts.async = true; rts.src = ('https:' == document.location.protocol ? 'https://' : 'http://') +
'YOURDOMAIN.COM/js.js?random=' + Math.floor(89999999*Math.random()+10000000) + '&millis='+new Date().getTime(); var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(rts, s); })();
</script>
This goes into js.js or whatever you want to call it, but update in the code above
http://pastebin.com/TgcXmCYx