Well despite me not liking that type of redirection i still don't want you missing out on your mobile visitors - so i have a fix for you
Replace http://www.yourdomainhere.com with the domain you want to redirect your mobile visitor too
Place the code before your </head> tag in your html code.
Hope that helps!
1) Google mobile bot will not be redirected to your site using this method
2) As mobile screen sizes become bigger this will become less effective.