Previous/Next

Sakin, When someone clicks on a post within a certain category the previous/next arrows show up at the top. When you click them, instead of pulling up the next or previous post within that category it pulls up the next chronological post no matter what the category. So if someone clicks on a Hair / Hair Color / (Post ex.)'Four Words I never Thought I'd Say' when they press the 'next'they get an article about face treatments since that is the next post I wrote. What I would like it to do is pull up the next article in that subcategory (hair color). Help! Kim Hidemyage.com