Using a tweening function as a rollover. Please help me restore functionality!

Question

Ok, I have a movieclip with 3 different tweens applied to it
by a few functions. The first tween happens on rollover and makes
the movieclip a little bigger, the second tween happens on rollout
and makes it smaller. The third tween happens on release and makes
the clip much bigger. However, when the user clicks the movie clip
it deletes all of the rollover/rollout/onrelease commands so that
the user can interact with a swf which is loaded into the mc.
Here's my code so far:
//Tweens//
function grow(who) {
who.onEnterFrame = function() {
if (this._xscale<40) {
this._xscale += 5;
this._yscale += 5;
if (this._xscale == 40 && this._yscale == 40) {
delete this.onEnterFrame;
function shrink(who) {
who.onEnterFrame = function() {
if (this._xscale>16.5) {
this._xscale -= 5;
this._yscale -= 5;
if (this._xscale == 16.5 && this._yscale == 16.5) {
delete this.onEnterFrame;
function growBigger(who) {
who.onEnterFrame = function() {
if (this._xscale<100) {
this._xscale += 5;
this._yscale += 5;
if (this._xscale == 100 && this._yscale == 100) {
delete this.onEnterFrame;
//End Tweens//
loadMovie("preloader.swf", "preloader_mc");
preloader_mc._xscale = 21;
preloader_mc._yscale = 20;
this.onRollOver = function() {
grow(this);
this.onRollOut = function() {
shrink(this);
this.onRelease = function() {
delete onRollOver;
delete onRollOut;
delete onRelease;
_root.MkXpos = _root.touristsMark._x;
_root.MkYpos = _root.touristsMark._y;
_root.pan(_root.mapContainer_mc);
growBigger(this);
_root.mapContainer_mc.map_mc.dragger_mc._visible = false;
_root.drag = false;
All of this works just fine. My only problem is that when the
user exits the loaded swf I want the button to shrink back down and
have its functionality restored. Basically when someone clicks the
exit button on the external swf it runs the shrink(who) function
and shrinks everything back down. I put a line of code into the
shrink function when it checks to see if "who" is at 16.5, which
looked like this:
if (this._xscale == 16.5 && this._yscale == 16.5) {
this.onRollOver = function = () {
grow(this);
delete this.onEnterFrame;
However, that didn't restore the functionality. Any help
would be greatly appreciated! I'm a poor student on a deadline

Answer 1

I'm such a moron. I never put in a trace command to see if
the last line of my shrink command was getting executed. It turns
out the movie doesn't scale perfectly to 16.5 but instead goes to
16.49etcetc. As a result that last line wasn't being executed. Now
everything works. But I was wondering if you guys could think of a
nice way to compartmentalize all of this code, like maybe store it
all in a variable or something, so I can attach it to several
different movie clips?