/thumbs/ instead of /uploads/ for Mobile version?

[volaverunt]

Hi! I have a question...

I need than "mobile.myweb.com" show the thumbnails instead of normal images for mobile template.

I have myweb.com for Pc and mobile.myweb.com for Mobile browser, all work's fine!! Except the images size.

Is it possible replace automatically "uploads/image.jpg" for "thumbs/thumbnail.image.jpg" whit some php code or javascript function in the template or something?