Scaling images on rollover

I have a situation where i have 30 images on a splash page and when you rollover the small image it creates a larger version at the 4 corners of the page. See example here:Splash

Currently i am using this script:

on (rollOver) {
	this._width = 128;
	this._height = 128;

on (rollOut) {
	this._width = 32;
	this._height = 32;

but this code has the small image dissappear on rollover as the bigger image displays. Is there anyway that i can have both images displayed on rollover? Does anyone know a script for this action? By the way i want to make the page so that the user is only loading the one larger image instead of 2 of every image. Again take a look at the link above.