Easy Form Payment Script For Membership Options

We need assistance to build a form on our html page to allow customers to upgrade their purchase. The form would have different checkboxes and when the customer check one of the boxes, the add to cart button would change to another payment link that is associated with clickbank. Here's an example - Checkbox #1 - Yes, I want to upgrade my package with all the following bonuses below. Checkbox #2 - Original Item (must always remain checked, if customer wants to uncheck, then a popup will appear and says it's not allowed) Checkbox #3 - Bonus #2 Checkbox #4 - Bonus #3 (membership) < Add to cart button > There will be 2 links over here - Link #1 is only the link to pay for the original item. Link #2 is the link if the customer wants to add Bonus #3 into their shopping cart. So when checkbox #1 is clicked, checkbox #2, #3 and #4 is automatically checked. And when checkbox #4 is checked, the add to cart button would direct them to Link #2. If checkbox #4 isn't checked, then the add to cart button would only direct them to Link #1. This is the gist of the project. Our website is only html so we don't expect to use php coding - maybe only javascript and html. Please include the following code name "HTTP43234" when you bid for the project. We will send you more details of the project before we finally choose you as the provider. Thank you.