SimpleOverlay adds any number of image layers onto a map. Layers can be added based on both screen axis and map axis. Layers can move with screen or stay on map. Layers can contain image or tiling image. The position, opacity, and z-index of layer can be assigned. Tiling layers can be animated.
Layer settings are binding to a map and will be automatically saved. Only need to add once per map.
opacity setting: 0-255
z-index setting: -1-11 or greater. -1: below almost everything. 11 above almost everything.