function init_maandkeuze() {
	if(typeof dom.handles['maandenholder'] != 'undefined'){
		offset = _get_offset(dom.handles['maandenref']);
		dom.handles['maandenholder'].style.top = parseInt(offset['y']) + "px";
		dom.handles['maandenholder'].style.left = parseInt(offset['x']) + "px";
		dom.handles['maanden'].style.top = -204 + "px";
		dom.handles['maandenholder'].style.visibility = 'visible';
	}
}

function onMaandUp() {
	if(parseInt(dom.handles['maanden'].style.top) < 0) {
		dom.handles['maanden'].style.top = (parseInt(dom.handles['maanden'].style.top) + 20) + "px";
	}
}
function onMaandDown() {
	if(parseInt(dom.handles['maanden'].style.top) > -408) {
		dom.handles['maanden'].style.top = (parseInt(dom.handles['maanden'].style.top) - 20) + "px";
	}
}