Javascript links not working with Firefox - but do work with Safari

I think what I'm talking about are javascript links...when you go to, for example, http://www.pbs.org/newshour/ I'm talking about the links in the box on the right labeled "Most Watched Video." None of the links IN THAT BOX work for me. By "work" of course I mean go anywhere or do anything. It's as if I'm clicking in an area of a page without links.

This happens for me in other sites with similar links. What gives?!

I've checked Firefox and am running the latest version of javascript. I'm also running the latest version of Firefox 3.6.8. I'm on a Mac OSX 10.4.11 - old system software, I realize, but I simply haven't been able to afford moving beyond this (plus my Mac is a Macbook, 2GB RAM, 80GB HD - old unit).

Any suggestions to remedy this situation? Thanks!