Delay action by frames

How do you delay an action until a certain number of frames?
on (release) {
play();
function loadIn(movie) {
content.loadMovie(movie);
clearInterval(loadInterval);
}
loadInterval = setInterval(loadIn, 200, “musical/interviews/peteteo/peteteo.swf”);
}

This is the code for milliseconds, however, its not efective.

any clues?