Howdy,
We're running ZenCart 1.3.8 and are trying to allow customers to modify an attribute (extended warranty) on the shopping cart page if they choose to.

I've checked out these two discussions of this idea already:
http://www.zen-cart.com/forum/showthread.php?t=80449
http://www.zen-cart.com/forum/showthread.php?t=80758

But what I'm hoping to do is set it up so that customers don't have to leave the page, just update their options.

Does anybody have any suggestions on how to proceed that way?

Thanks,
David