Working With The authorize.net Server Integration Method (SIM) Payment Gateway, Part 1
Example 3: Using JavaScript To Change Individual Order Options

This page shows how JavaScript can be used to change the values of any DOM element. The values of the base membership will be one-tenth of their stated / hard-coded values.

Choose a base membership:

Annual banquet tickets:

Would you like to purchase a T-shirt?

Your order total: $0.00

Example 1: A Form That Computes Order Total Via JavaScript
Example 2: Poisoning the order_total_input Variable
Blog entry: Working With The authorize.net Server Integration Method (SIM) Payment Gateway, Part 1: Don't Use JavaScript