How can I place this currency converter on my website?

[HelloHello]

I like the currency converter that these sites are using. Does anyone know of where I can get the code for my own website? Thanks.
There is a little box called "currency" that allows you to change the currency:
http://www.dereon.com/nshop/product.php?dept=&category=&view=detail&productid=DE-DD7512GIFTCARD&startColor=&groupName=JacketsBlazers&page=

At the top of this site it says USD:Change
http://www.net-a-porter.com/am/Home.ice

I would like to find a simple way of allowing customers to be able to purchase items in any currency. Using an accurate currency converter. Thanks.

[KDLA]

http://www.textor.com/cconv.html

(You can style those price input boxes without borders.)

KDLA