Event-Transparent Div

Event-Transparent Div

I'd like to create an "Event-Transparent" pluggin.  Basically you give a div or whatever a class of event-transparent, and all events that would go to the given div instead go to whatever is beneath it.

Why?
For me I have a div that has a moveable map inside it, and some css effects and other divs inside it that add shading around the edges, so that as the map reaches the edges it fades out.  The problem is that none of the events done on the shading get through to the lower layer.  I have other ideas that are very similar, they all include a need to make something look nice, but only have the div be decoration (and generally the div is semi transparent).

My Question?
Is this possible?  Where should I start?