function display_activity(year,month,date){

var url="./services/agenda.php?year="+year+'&month='+month+'&date='+date;
var objHTTP = GetXmlHttpObject();
if (!objHTTP) {
            alert('Giving up :( Cannot create an XMLHTTP instance');
            return false;
        }
objHTTP.open('GET',url,true);
objHTTP.onreadystatechange = function() 
	{
	if(objHTTP.readyState == 4) {
		if(objHTTP.status == 200){
		var st=objHTTP.responseText;
		document.getElementById('span_activity').innerHTML=st;
		document.getElementById('span_loading').innerHTML='';
		}else
			alert('problem with request');
		}
			
	}
objHTTP.send(null);

}