How To Modify Drop Down Image Selector

1) Script Title: Image Selector using selection list

2) Script URL (on Javascript Kit):
http://www.javascriptkit.com/script/cut173.shtml

3) Describe problem: This script works great, however, I am using the script to show different color t-shirts. Each shirt needs to load a javascript file from the server (ie: you select Red and the Red shirt appears, but also calls the appropriate javascript file needed for the form to give you the correct pricing.

Can anyone help me here? I've got the javascript needed to load/unload the pricing info and I've got the javascript to change to shirt colors, but since the list box's value is already 'spoken for' to call the image, I don't know how to include the javascript to also change the pricing info.