nclocal on "Have a NON blog - Standard html MAIN site to redirect to a Mobile Wordpress Blog"

I built out a lovey WP blog mobilized for a local business on a m.subdomain.com for them. How would I connect / redirect their MAIN site to their Mobilized BLOG site for Mobile Device User Detection?
I see scripts taking a html html5 mobile site to a Main Blog site - I do not see a script/plugin to reverse this.
I want their mobile users to be redirected to their Wordpress Mobilized blog and Keep their Main Standard site alone.
Thanks.