CQ and Javascript redirection

Good afternoon.

Im trying to write a little javascript, that detects mobile agents.

If the agent is a mobile device, redirect.

<script>
window.onload = function() {
    if(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)) {
        // If Mobile: Redirect
        window.location.replace("http://www.externalurl.com");
    }
}
</script>

Unfortunately, CQ doesnt like external URL redirection.
Is it possible, inside CQ to redirect from the client?
And if it is, how does one do it?

Kind regards
Toby