function reageer(id) {
	obj = document.getElementById(id);
	if(obj.style.display !== 'block')
		obj.style.display = 'block';
	else
		obj.style.display = 'none';
}
function dropdown(o, active) {
	if(o.lastChild.childNodes.length > 0) {
		if(o.lastChild.style.display !== 'block') {
			if(o.className !== 'element_active')
				o.className = 'element_active';
			o.lastChild.style.display = 'block';
		}
		else {
			if(active !== true)
				o.className = 'element';
			o.lastChild.style.display = 'none';
		}
	}
}