Sql/Php Based Image Pop-Up On Text Hover... Possible?

I have my order form located below:

http://www.yorkesofdundee.co.uk/forms/locals/form.php

All of the products are entered into mysql.

I opted for the order form instead of a whole online store because I hate trying to buy online and having to go through about 20 different pages just to order. Can anyone tell me how to add a feature similar to that shown on templatemonster.com 's index page? Notice, when you hover over one of the 4 templates it has a larger image load.

The images shouldn't be pre-loaded...I have 100 products and it would take forever just to see the order form. Can anyone suggest a suitable way of doing this?

Thanks!