Upload file in subdomain

[eluser]tnathos[/eluser]
hi, i suppose what my question its stupid.. but i dont find the solution..

i have my app in a www.myapp.com and i need use across subdomains for storage the images files in a subdomain and optimize my site.. so i make a www.imgs.myapps.com

now i use the upload file library.. but i cant setuo the path for upload the files..

i see the tree directory and find

/public_html/uploads_imgs/ -> directory for images in the www.myapp.com
and find /public_html/imgs/uploads_imgs/ -> directory for images in the www.imgs.myapp.com

so what i need put here in the library upload?

Code:

$config['img_2']['upload_path']     = './uploads_imgs/';

thanks