style button to look more like a button
add fourth registration point to map data
add glMatrix library

Used to transform geographical coordinates to pixel
coordinates on the map.
 
http://glmatrix.net/
https://github.com/toji/gl-matrix

uses BSD-like open source license

version used:
https://github.com/toji/gl-matrix/commit/0d883365e
use projective transformation for Geo => Map-pixels

Adapted Martin von Gagern solution he posted on http://math.stackexchange.com in response to this question:

Finding the Transform matrix from 4 projected points (with Javascript)

http://math.stackexchange.com/questions/296794/finding-the-transform-matrix-from-4-projected-points-with-javascript/339033#339033

Martin' jsfiddle example: http://jsfiddle.net/dFrHS/1/
fix bug where still image for 1A would play once

Fixed this bug:

If right arrow was pressed after loading Map page the
still image for waltz1 would play for both 1A and 1B.