how do you insert a mouse over script into a product page on zc1.3.8a?

for example I would like to have a series of images that shows a step by step process, so when the user mouses over an image, that image appears larger.

here is an example of a mouse over script that I would like to put on a product page: http://www.a1javascripts.com/mouseov.../doublemo.html

or if there is a better way or script, please share. :-)

thanks!