function toggleLayer(boxID) {
	/* Obtain reference for the selected boxID layer and its button */
	var box = document.getElementById(boxID);
	
	/* If the selected box is currently invisible, show it */
	if(box.style.display == "none" || box.style.display=="") {
		box.style.display = "block";
	}
	/* otherwise hide it */
	else {
		box.style.display = "none";
	}
}