Make plugin work in 1 category only

I would like to know if there is any possibility for this plugin to work using category. For example: I have ‘Category1’ and ‘Category2’ some posts each, both in main menu. So if i press ‘Category1’ from my menu and hit next post, result should be just from ‘Category1’ and not mix them up with the post from ‘Category2’. Can it be done?

Thanx

http://ww.wp.xz.cn/plugins/wp-single-post-navigation/