How to create a time delay prototype script

1

problem:
how to create a time delay prototype script.

situation:
click on buttons to run a display mc1 after 2 sec delay

//script on button//
on (press) {
_root.mc1.wait();
}

script needed:

MovieClip.prototype.wait = function() {
_root.mc1.gotoAndPlay(2);
this.clearInterval(this.setInterval(wait, 2000));
}

thanks