Hover an area activate an image rollover

[Moon Lee]

I want to improve hovering area in my Blog Archive!

3 images artwork (Hovertop, left, & right) in my (BlogArchive1).

How to implement User touch any parts of (BlogArchive1, left or right) can activate an Rollover image (Hovertop)?

http://jsfiddle.net/fCsNN/239/

Help!