product_info.php show order total with Product attributes on fly

[aamirch]

Hello,

I want that product_info.php page show order total with selected product attributes. same like this os commerce site

 

http://www.gowfb.com/*4-PC-Savannah-Cherry...roducts_id=1798

 

they use javascript which show net total in table after product attributes drop down. order total change on fly when product attribute select. so any guide line that how it will be don ?

 

Thanks