next_posts_link button moves position

I had my site working great and fine then one day I viewed it in firefox and it had changed. Here’s the issue:

My posts are pics. I post at most 4 to a page. at the bottom of the page I use next and previous buttons. They are in place using position absolute. In Safari they are fine but in Firefox the buttons were somehow pushed down below the footer image. The site is:Adventure Refugee. Maybe it is how I am using tables and divs I am not sure.