Creating Custom Routes with Google Maps

[dayday via StackOverflow]

I am trying to figure out the best way to go about this.

I want to create a page where users can input a from and to form allowing them to use any address in the United States. When the user submits their to and from information, they would be returned with a list of store locations on that route, drawing from a database of locations that would be within' defined distance of that route (say, 10 miles).

Is there anyone out there who could advise as to the best way to go about this? I want to make something like is listed here:

http://dreamdealer.nl/tutorials/adding_travel_modes_and_waypoints_to_google_maps_directions.html

Only with my own custom data that could be updated.

Thanks

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