Yes, it's done with the css z-index attribute. The highest z-index goes on top. Read more here.
buddylee17 216 Practically a Master Poster
Dukane commented: excellent, quick solution! thanks +2
buddylee17 216 Practically a Master Poster
peter_budo commented: Nicely spotted... +10
buddylee17 216 Practically a Master Poster
buddylee17 216 Practically a Master Poster