I'd be asking "what expanding links" -- but that's probably because it's broken here with the area to click on not lining up with the expanding image in FF and it not even working in Opera.
Though that's typical of most .gov addresses these days where they go "Accessibility, what's that?"
Since I can assume that the page you are linking to is NOT yours, and as such you can't change it, it is unlikely that it's possible to do what you are asking. That useless .GOV address' script appears to have no hooks for passing requests via GET, and you'd need to be able to edit their script to do it.
Though if that .gov page is yours, we need to have a little talk about the ADA.