Movieclip trouble, need some help

Hey, Im currently working on a Flash project in work and have got a bit stuck with what I hope is something relatively simple to overcome.

Basically I have a movieclip image (hoverover) where when the cursor rolls over the image when the flash is playing, text (caption) pops up and accompanies the cursor as the cursor moves a around the image, just like ‘alt tags/text’ on an image in an html site.

Therefore Im wondering, is it possible to make the image change its tint as the cursor rolls over the image as well as the text popping up? I have pasted what actionscipt I have used so far on the movieclip below:

hoverover.onRollOver = function() {
this.onEnterFrame = function () {
caption._alpha += (100-caption._alpha)/3;
caption._x -= (caption._x-_xmouse)/2;
caption._y -= (caption._y-_ymouse)/2;
hoverover.onRollOut = function() {
this.onEnterFrame = function() {
caption._alpha += (0-caption._alpha)/3;

I’d greatly appreciate any help at all, thanks. Chris