167426 Paypal calc script with checkb

Looking for a script that will allow a user to check boxes (options) and have amounts from each checked option total at the bottom. Then have button like add to cart that would then direct user to paypal for payment of total amount. I would like to have each checked option decription listed on line to show what they are paying for. Along with script I would ask for a little doc to expalin how I can add items or remove items (options as needed, along with pricing for each option). This is to be used for a site that a user will sign up for listings on various pages within the site, the options shall be a listing for the pages on the site. I will manually enter the otpion. For this example, please consider 5-10 options as an example of your script. Examples work for me in selecting programmer for this project. I would like to do this quickly, and bids that are not reasonabile will not be considered.