Distance Finder Problem!

http://www.wrestlefury.com/DataFiles.zip

The zip file contains a map, a spread sheet of distances between these towns
 and two files of data extracted from the spread sheet. The extracted data i
s a list of the towns and a table of distances. Both these files have the nu
mber of entries in the file on the first line. Click the following link to s
ee a picture of the program:

http://www.wrestlefury.com/distancefinder.jpg

I was wondering if anyone can help with the coding, i've got a bit of code w
hich is underneath, but i still think this is fairly hard. I've created the 
Interface, just need to do the remainder of the code. Any code or hints will
 be very much appreciated.

Thanks

PHP:

private Hashtable _distances;

int[,] distances

_distances=new Hashtable();

Hashtable birminghamDistances=new Hashtable();
birminghamDistances.Add("Birmingham",0);
birminghamDistances.Add("Cardiff",103);
...
_distances.Add("Birmingham",birminghamDistances);

// repeat for all towns

Post Follow-up to this message