Hello,
There is no sense in creating the mobile version in a different domain, its totally wrong. some sites use subdomains on the same domain for this purpose.
Different domain is an incorrect method.
These days responsive web design can save the hastle of getting a seperate system/design for mobile sites.
why don't you go for responsive web design for your site.
it will automatically shift to mobile or other screen sizes etc.
Here is what i did to my site (i am not very good with responsive yet) http://www.designzzz.com/