Improved version of blogspot PGN Viewer

I have added a White circle at the upper right corner to indicate that it's White's turn to move. The circle will be black if it's Black's turn to move. I also added some figures and letters at the sides of the board. Both indications are optional.

All the needed JavaScript is still incorporated within the blogger/blogspot template.

This is still a static diagram, but I am going to extend it to a complete game viewer.