var xmlHttp;

function get_calendar(urlstr, param, idstr) {
	xmlHttp = GetXmlHttpObject();
	if (xmlHttp == null) {
		alert ("FATAL ERROR! Your browser does not support AJAX!");
		return;
	}
	var url = urlstr;
	url = url + "&cym=" + param;
	url = url + "&rnd=" + Math.random();
	//alert(url + idstr + param);
	xmlHttp.onreadystatechange = function() {
	    if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
			//alert (xmlHttp.responseText);
			document.getElementById(idstr).innerHTML=xmlHttp.responseText;
		}
	}
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function GetXmlHttpObject() {
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
    		xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}