makeHttpRequest = function(url,params,result) {
	var http_request = false;
	if (window.XMLHttpRequest) {
		http_request = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		try{
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch(e){
			try{
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) {
		alert('Unfortunately you browser doesn\'t support XMLHttpRequest.');
		return false;
	}
	http_request.onreadystatechange = function() {
		
		if (http_request.readyState == 4) {
			if(http_request.status == 200) {
				result(http_request.responseText);
			}
		}
	}
	
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", params.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(params);
};


	done = function(response) { document.getElementById('calendar').innerHTML = response; }
	makeHttpRequest('/modules/cal.php','',done);

calNext = function(time) {
	done = function(response) { document.getElementById('calendar').innerHTML = response; }
	d = new Date();
	d.setTime(time*1000);
	d.setMonth(d.getMonth()+1);
	makeHttpRequest('/modules/cal.php?time='+d.getTime()/1000,'',done);
}

calPrev = function(time) {
	done = function(response) { document.getElementById('calendar').innerHTML = response; }
	d = new Date();
	d.setTime(time*1000);
	d.setMonth(d.getMonth()-1);
	makeHttpRequest('/modules/cal.php?time='+d.getTime()/1000,'',done);
}