Marker Rendering

Hi, 

I like the simpleness of your program, and it works pretty well on big maps. 

I missed the function to render the markers on the map, so I added a basic one.

Check out the example on:  http://www.skoonhoven.net/minecraft/#-935:105:64:9

The code is based on the examples of the Google Map API, as well as one on stack overflow.
See http://stackoverflow.com/questions/3059044/google-maps-js-api-v3-simple-multiple-marker-example

Hope this helps you.

Anne Jon