change the fps rate

you can't change the framerate with actionscript using as2.  you can with as3 and, you can fake it and play any movieclip at any (approx) framerate (forwards or backwards), no greater than the native frame rate, using playF:

to play a movieclip (eg, _root from frame 1 to its last frame 24 fps):

playF(_root,1,_root._totalframes,24);  // to stop it, use stopF(_root);

function playF(mc, m, n, fps) {

    playFFF2 = function(mc) {

        trace(getTimer());

        if (mc.m<mc.n) {

            mc.nextFrame();

        } else {

            mc.prevFrame();

        }

        if (mc._currentframe == mc.n) {

            clearInterval(mc.int);

        }

        updateAfterEvent();

    };

    mc.m = m;

    mc.n = n;

    mc.fps = fps;

    mc.gotoAndStop(mc.m);

    clearInterval(mc.int);

    mc.int = setInterval(playFFF2, 1000/mc.fps, mc);

}

function stopF(mc) {

    clearInterval(mc.int);

}