Remove portfolio tabbing left & right

Hello,

I have 2 sections on my site (www.lchapmandesigns.com) with a “portfolio” — design & writing. I would like to either limit or remove the ability to click left and right between portfolio posts.

1. If possible, I’d like to limit the left & right tabbing only to the items that are under the same page. So when you are on “writing” you can only click left and right between the portfolio items on that page. Right now, it will take you to other portfolio items that aren’t on the writing page. Here is an image of what I mean: http://www.lchapmandesigns.com/wp-content/uploads/2013/05/Screen-Shot-2013-05-18-at-7.01.09-PM.png

2. If that ability is not possible, I’d like to remove the ability to click left & right entirely. I don’t want to do this, but if there is no way to change this, how can I turn it off?

Thank you!