Google Maps Api Custom Routes Project

Hello, Okay so i have a simple google maps integration that maps two lat/long points between each other. Basically if you go my link below and hit submit...then zoom in abit and u will see "adelphi university" within this campus there are several buildings example "levermore hall, science building, swirbul, social work etc". Google can see this. What google isn't showing me are the walking paths that are present between each building. Since it is not showing I need a way to draw these paths from building to building so that next time someone does a submit for any building to another building , it will use these internal paths within the campus instead of going out to the road. Can you do it? Any samples of similar work? Example : [login to view URL] check the two radio buttons and click submit On the maps page, zoom in abit and you will see each building including "levermore" and "social works". However i need somehow to mark the internal path between the buildings so that google uses this custom path instead of the current path. This is a sample of the map with the internal paths between buildings that i want google to use instead of the way its currently doing i.e. using road paths. ------------------------------------------ Note: Previous bidder did not finish the project as promised. ------------------------------------------ thanks! naq