I have a concern about the shipping estimator popup, regarding the wording when a visitor is not logged in (or maybe when they are, as well)

I currently offer FREE SHIPPING over a certain amount.

If a visitor selects an item, then goes to their cart and clicks the "estimate shipping" link on the cart page, the language used on that popup is confusing. It reads like the order total is the shipping cost and does not prominately state FREE SHIPPING for orders over $xx. I would like that to be prominent, but only if the FREE SHIPPING is on. What would be the best place to change the text on that popup so the visitor isn't confused?

If their order is NOT at or over the free shipping amount, I'd like to have text there that states something like "Get FREE SHIPPING for orders over $XX!"

Jack