function showY(elementID) {
	with(document.getElementById(elementID).style){
		visibility="visible";
		display="block";
	}
}

function showN(elementID) {
	with(document.getElementById(elementID).style){
		visibility="hidden";
		display="none";
	}
}

function showT(elementID) {
	with(document.getElementById(elementID).style){
		if (visibility=="hidden") {
			visibility="visible";
			display="block";
		}
		else {
			visibility="hidden";
			display="none";
		}
	}
}