Modal pop-up style page

[el_carl0s]

Hello im using vituemart 2.0.8 and joomla 2.5.6

I want to know how to load a template in a modal pop-up style, for example:

http://www.victoriassecret.com/clearance/pink-loves-major-league-baseball/new-york-yankees-v-neck-tee-victorias-secret-pink?ProductID=61611&CatalogueType=CLR

in that page if you click "Size & Fit" a modal pop-up is displayed with a custom page showing information about sizes

i would like to know how can i add this feature to my default product details page where i can have a link that when pressed displays a custom page designed by me in a modal pop-up style just like when you press the add to cart button