Simple redirect to a URL:
<script type="text/javascript">
window.location.replace('http://www.google.com/');
</script>
Redirect to a URL and pass through URL parameters and #anchor fragments
<script type="text/javascript">
window.location.replace('http://www.google.com/' + window.location.search + window.location.hash );
</script>
For either script, the placement should be head.
Be sure to add it to a single page and not to Script Manager.