1. Go to Content > Content Management System
2. Hover over the name of your website and click Manage Website
3. Click the Administer tab
4. Click on the linked file(s) ending in .ktf
5. In Internet Explorer click View > Source
6. Under the beginning head tag of the code enter this script (replacing www.google.com with your desired redirect URL): 

<script type="text/javascript">
<!--
window.location = "http://www.google.com/"
//-->
</script>

7. Save your new KTF file to your computer
8. Go back to the Administer tab of your CMS site
9. Click Edit
10. Upload your new file, making sure to mark the checkbox for "Overwrite existing destination files"
11. Click Update

Your Javascript redirect should now be in place.