[ic] Pre Checkout Page

[AirDelights.com]

Hello,

  Hope someone can help with this.  I need to set up a page or pop up box
between the cart display and the checkout page to ask the customer for their
zip code.  Ideally when the customer clicks the checkout button on the cart
display page, a pop up box would open requesting the customers zip code.
Once the customer enters their zip code they are taken into the checkout
page and the correct shipping fee's are then displayed for shipping to their
zip code.

Does anyone use something like this, or know how I can set this up on my
interchange cart?

steve at airdelights.com