function activate( object ){
	object.parentNode.className = 'active';
}
function deactivate( object ){
	object.parentNode.className = '';
}
function vgv( object, antwoord ){
	if( !object.status ){
		object.status = 'open';
	}
	else{
		object.status = object.status == 'open' ? 'close' : 'open';
	}
	
	switch( object.status ){
		case 'close':
			object.firstChild.innerHTML = '+ ';
			document.getElementById( antwoord ).style.display = "none";
			break;
		case 'open':
			object.firstChild.innerHTML = '- ';
			document.getElementById( antwoord ).style.display = "inline";
			break;
	}
}