function event_ajax(id)
{
	var ajax = new Ajax('post', '/ajax_getevent/');
	ajax.add_value('id', id);
	var d = document.createElement('DIV');
	d.className = 'ajax-loader';
	var i = document.createElement('IMG');
	i.src = '/img/ajax-loader.gif';
	var r = document.getElementById('agenda');
	var h = r.offsetHeight + 2;
	i.style.marginTop = ((h - 66) / 2) + 'px';
	d.appendChild(i);
	d.style.height = h + 'px';
	d.style.width = r.offsetWidth + 'px';
	d.style.marginTop = -h + 'px';
	r.appendChild(d);
	ajax.set_readystatehandler(function() {
		// get the correct box
		var a = document.getElementById('agenda');
		var p = a;
		while (!(p.tagName && p.tagName.toUpperCase() == 'DIV' && p.className && p.className == 'box')) {
			p = p.parentNode;
		}
		p.innerHTML = this.http.responseText;
		init_scrollbar(document.getElementById('agenda').getElementsByTagName('DIV')[0]);
	});
	ajax.execute();
}