var _sl_offset = 0;

function next_month(lang, chalet) {
	_sl_offset = _sl_offset + 2;
	update_slider(lang, chalet)
}

function prev_month(lang, chalet) {
	_sl_offset = _sl_offset - 2;
	update_slider(lang, chalet)
}

function update_slider(lang, chalet) {

	url = '/' + lang + '/availability/' + chalet + '/?offset=' + _sl_offset;
	
	
	
	new Ajax.Request(url,
			{ onSuccess: function (transport) {
								var data = transport.responseText;
								new Effect.Fade('slider', { duration: 0, afterFinish: function () {
									$('slider').update(data);
									new Effect.Appear('slider', { duration: 0.5 });
								}
								});
			}});


}