finding shortest path between two points

[Solomon]

hi guys
 thank u for ur support. now does anyone has a clue on how to implement
pathfinding. the user specifies source and destination, and code finds the
shortest distance between source and destination (like what is implemeted
in yahoo maps) and then the path is highlighted. am using mapserver
4.4.2,phpmapscript,oracle 9i spatial all running on linux. any help in the
right direction will be appreciated.