function showHide(identifier) {
	var element = document.getElementById(identifier);

	if (element.style.display == "block") {
		element.style.display = "none";
	} else if (element.style.display == "none") {
		element.style.display = "block";
	} else if (element.style.display == "") {
		element.style.display = "block";
	}
}