compareAgainstCurrentLayer(sLayer, sCurrentLayer) {
			var sCurrent = sCurrentLayer || LayerUtils.getCurrentLayer();
			// If sLayer is undefined, it is assumed it be on the lowest layer
			if ((this.getLayerIndex(sCurrent) > this.getLayerIndex(sLayer)) || !sLayer) {
				return -1;
			} else if (this.getLayerIndex(sCurrent) === this.getLayerIndex(sLayer)) {
				return 0;
			}
			return 1;
		}
Compares current layer with a provided layer
-1: Lower layer, 0: Same layer, 1: Layer above.

@param {string} sLayer Layer name to be evaluated
@param {string} [sCurrentLayer] Current layer name to be evaluated, if not provided the layer is taken from URL parameter
@returns {int} -1: Lower layer, 0: Same layer, 1: Layer above
@public