// display.js
// Leonardo Favre 2008

function hide(who) {
// hides a element.
	document.getElementById(who).style.display='none';
	return false;
}

function show(who) {
// shows a element.
	document.getElementById(who).style.display='block';
	return false;
}

function swap(who) {
// shows a element if it's hidden; otherwise hide it.
	if (document.getElementById(who).style.display!='block') {
		show(who);
	} else {
		hide(who);
	}
	return false;
}