Sharepoint top link bar link permissions

I have Sharepoint Foundation 2010 and need to hide on of the links from all users and make it visible only for specific users?

I had to delete on of the links created along with a Site it was linking to(it was only visible to people intended to see it). When I recreated it manually, I got into a problem that people that not suppose to see that link(bacause they don't have permission to access that site) can see it.

Only thing I noticed is that when going to Site Settings--> Top link bar--> click on link one I recreated can be edited, other links that were created along with a sites they are linking to can not be edited and a Type the Web address field is greyed out for them.