Control-click behaviour using Prototype

Hi all,

Is it possible to use Prototype to add control-click behaviour to a
link? What I want is to fire one Ajax request if a user clicks on a
box, and a different request if they control-click on the same box. I
know this is possible in some JS frameworks (e.g. Mootools), but
unfortunately I’m limited to Prototype - does anyone know how to do

Many thanks,