function onoff($textblock) {
	if (document.getElementById($textblock).style.visibility != "visible" || document.getElementById($textblock).style.display == "none") {
		document.getElementById($textblock).style.visibility = "visible";
		document.getElementById($textblock).style.display = "block";
	}
	else {
		document.getElementById($textblock).style.visibility = "hidden";
		document.getElementById($textblock).style.display = "none";
	}
}