Ok, attached goes:
jquery.nt-maps.js (the folded code, to call the leaflet_numbered_markers.js is between //ARMi and //end ARMi)
leaflet_numbered_markers.js
and
leaflet_numbered_markers.css
The code extracts the number from the icon Tip, yo can change it as you need.
To make it work:
Replace the jquery.nt-maps.js in ..\scipts
Copy leaflet_numbered_markers.js to ..\scripts
Copy leaflet_numbered_markers.css to ..\styles
Add leaflet_numbered_markers.js to the Webserver
Add leaflet_numbered_markers.css to the Webserver
Hope it helps