Another Simple ASP Project.

Hi, I need a zip code to zip code mileage calculator that will take the mileage and calculate the cost at the rate per mile. Then I can input this into an order form. Thats it. What I am exactly looking for is a way for the user to enter an address for the origination and destination and then use the zip code for both addresses to calculate the price per mile. E.g. 11111 to 55555 is 600 miles at $1/per mile so it shows the total of $600 in an input box that I can then insert if they place an order. The code for this would have to be pretty simple for me to insert, or have GREAT instructions. My max budget for this simple asp project is $60. Happy Bidding.