Ajax Price update Virtuemart in VirtueMart, Joomla

Need Ajax price update (on product browse page) for VirtueMart, Joomla. Something similar to this site: [login to view URL],com_virtuemart/Itemid,293/page,shop.product_details/flypage,[login to view URL],29/category_id,7/manufacturer_id,0/vmcchk,1/ Say, I've a product with 2 different weight and price. For example: Product A 500g - $10 1kg - $15 By selecting a weight from the drop down, the price of the product should be changed on the product page without refreshing the page (ajax). Again, something similar to the link provided above. Also, the price of all my products are shown like this: Product A Our Price: $9.95 (RRP $19.95) You Save: $10.00 All my products have discount price. So that needs to be updated by changing the product type as well.