There's a guy over at the edmunds board that has show pics that detail the screws inside the rocker panels for the side skirts - but having had factory accessory trim added at the dealership on a Honda before I can attest that they're majorly into the 2 sided tape thing along with select screw on mounting.
points.
http://townhall-talk.edmunds.com/WebX?14@@.ef0ae5b/1752