Rails Engine asset path

Hi all,

I have created Rails Engine,it's working fine but for asset path it's
taking from Main app..so,it's showing following error.

ActionView::Template::Error (No such file or directory - Asset file
not found at '/home/kingston/broking_workspace/Rails-Engine/public/
stylesheets/application.css')

but i want to change engine asset path...

Please help me.

Thanks,

kingston.s