litecommerce product rating

Need someone familar with litecommerce shops to add a product rating sytem "out of 5 stars" to each product (and future products) in this litecommerce shop - [login to view URL] - similar size stars to amazon - customers must have purchased product to vote (**see email validation below) - next to star rating it shows number of people that have rated the product - customers would vote by clicking 'your vote' link underneath the star rating which goes to page with radio button for; 1 Star - Poor value for money 2 Star - Average value for money 3 Star - Good value for money 4 Star - Excellent value for money 5 Star - Outstanding value for money **and a box to enter email (which checks with the database to see if this email was used to buy this product)