Google Maps API transport calculator needed

Need to add a "Nearest Transport" link functionality to my clients website. User will click on "Transport" button and it will show a Google map of where the property is and where the nearest tube / train stations are. There will also be a table underneath showing the distances. It must work like the foxtons property website, but with Google maps. See this link and then click on Transport to see how theirs works: [login to view URL] Website to add this to: [login to view URL] There will be another Button called "Transport" next to the other items at the bottom, which the user will click on and another window opens with the transport information. I need to be able to easily pass in the postcode dynamically from the database and the code will work out nearest stations, show the property on the map, the stations on the map and the distance calculations underneath in a table. Need this done fairly quickly please.