Tabs inside accordion disappear when scrolling

Tabs inside accordion disappear when scrolling

I have tabs inside a few sections of my accordion menu. The problem I have is that when long content creates a scrollable window, the tabs also scroll up and eventually disappear up the top.

Is there a way to scroll the content without the tabs actually moving long with it?

Here's the page (a good example is in: Things that can harm your pet / Holidays)
http://www.vetclinicpv.com/animal_health_diseases5.html

Thanks!