function getElem(name)
{
    nr=document.getElementById(name);
    return(nr);
}

var last_visible = false;
	
function toggleAnswer( answer_id ) {
	
	var answer_ref = document.getElementById( answer_id );
	if( answer_ref ) {
		if( last_visible ) {
			last_visible.style.display = 'none';
		}
		if( ( answer_ref.style.display == 'none' ) ) {
			if ( last_visible == answer_ref ) {												
				last_visible = false;
			} else {
				answer_ref.style.display = 'block';
				last_visible = answer_ref;
			}
		}
	}
}function getElem(name)
{
    nr=document.getElementById(name);
    return(nr);
}

var last_visible = false;
	
function toggleAnswer( answer_id ) {
	
	var answer_ref = document.getElementById( answer_id );
	if( answer_ref ) {
		if( last_visible ) {
			last_visible.style.display = 'none';
		}
		if( ( answer_ref.style.display == 'none' ) ) {
			if ( last_visible == answer_ref ) {												
				last_visible = false;
			} else {
				answer_ref.style.display = 'block';
				last_visible = answer_ref;
			}
		}
	}
}