hitTest

i am using as inside a movie clip for a hit test but t is not working


onEnterFrame = function () {
 if ("../char".hitTest("../rbul" add shotname)) {
  setProperty("../rbul" add shotname, _x, 242348);
  tellTarget ("../health") {
   nextFrame();
   nextFrame();
  }
 }
};

the “…/rbul” add shotname is a duplicate of a movie clip that i cant change in order to get the game working
does anybody have any suggestions on what i should or could do
please reply
thank you in advance