function createObject() {
var tipo_richiesta;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
tipo_richiesta = new ActiveXObject("Microsoft.XMLHTTP");
}else{
tipo_richiesta = new XMLHttpRequest();
}
return tipo_richiesta;
}

var http = createObject();

function richiedi(valore,form,campo,root) {
http.open('get', root+'common/function/calendar.php?tipo='+valore+'&form='+form+'&campo='+campo+'&root='+root);
http.onreadystatechange = handleResponse;
http.send(null);
}

function handleResponse() {
if(http.readyState == 4){
var response = http.responseText;
document.getElementById('calendar').innerHTML = response;
}
} 

function setta(form,campo,value){
	document.getElementById(campo).value = value;
	document.getElementById('calendar').innerHTML = null;
		 
}