Help with button + hittest of other objects

sorry to bother you guys with this trivial question but im starting to use flash again and ive drawn a blank on small problem.
the problem is that i have a button and i forget how to add the hittest kinda action thingy to it. i have this attacted to my button clip.

on (release) {
if (_root.guy.body, hitTest(_root.thing)) {
_root.thing gotoAndPlay(2);
}

i forget wat to do here to make my thingy work with the hittest.
plz help