function dualToggle(e1, e2) 
{
	toggle(e1);
	toggle(e2);
}
			
function toggle(obj) 
{
	var el;
	if (typeof obj == 'string') el = document.getElementById(obj);
	else el = obj;
	if (!el) return;
	if (el.style.display != 'none') el.style.display = 'none';
	else el.style.display = '';
}