relative path vs. INCLUDE() !!!!!

Hello ! I've just made a nice navavigation bar for my website .... The nav. bar is a php file (Templates/inc_nav.php)containing links to other pages of my site. the links has been made relatively to the file "inc_nav.php"; Now that I've included the "inc_nav.php" in other pages , my links no longer work ... it seems that PHP just copy the content of the nav bar into other pages so , links are now relavite to the current page and this of course doean't work !!! :-((( Is there any workaround or any othe way to include a nav bar in PHP without breaking the links ? I hope you understand what I mean ... Thanks Arcad.