I need to have my store checkout process altered slightly so that, prior to completing the order, the cart is redirected to a specific URL. For the purpose of my question, let's say the URL is:

http://www.mysite.com?ordernum=23&email=joe@mail.com&meth od=creditcard

Does anyone have an example of how to do this? I've read that using a webquery might work, but I don't know where exactly to place this code. If someone out there could just tell me which file I need to place the redirect code in, and an example of what the code looks like, I'd be very grateful.

Also, I don't have access to the code base, so i'd need to be able to do this redirect in the orderconfirmation aspx or xml page (hopefully).

Thanks!