Statement must appear within on/onClipEvent handler

programming flash
1

Hi!
I don´t know how to handle this:

on (press) {
  var box = _root.createEmptyMovieClip("holder", _root.getNextHighestDepth());
  box._x = 150;
  box._y = 100;
  preLoad(box, "loaded.swf");  };

Statement must appear within on/onClipEvent handler

it´s the line :
preLoad(box, “loaded.swf”);}