Mobile detection and forwarding

I have a wordpress site, and would like install a mobile phone detection script (or plugin) that would forward my user (when they are on their mobile phone that are not smart phones) to a specific URL, where I have made a completely different site for the them.

Here is my site: http://atashi.jp/wedding/
I would like mobile users (non smart phone users) to go here: http://atashi.jp/wedding/m/

It would be great if that can be done without the user noticing.

Please advice.

Thank you.