Double click problem

Hi gang: I have a situation where users can purchase stuff online. In the last step in the process, the user clicks a "confirm purchase" button and their credit card is checked and if it's valid, they are awarded the product. Everything works, but it takes a little time to check the credit card. During the time it takes to send the credit card information to the clearing house and get back an "Ok" with a transaction ID, the user can click the "confirm purchase" button more than once. As such, more than one order can be made during the process. I was thinking of using the database to prohibit multiple "confirm purchase" clicks made by the user, but I wanted to ask this group if anyone has a simpler idea/solution? Thanks, tedd -- ------- http://sperling.com http://ancientstones.com http://earthstones.com