use same Gallery in all multisite

hello

i will like to know how can i use — same gallery for all different multi sites that i have on WPMU.

can some one tell me what do i need to change and were the change must take place?

i need to use same gallery upload folder to be display in all multisites

thanks
1. i have change Gallery path: to wp-content/blogs.dir/1/files/ -but when open a subsite — does not display the gallery

http://ww.wp.xz.cn/plugins/nextgen-gallery/