var http;
var browser = navigator.appName;
if ( browser == 'Microsoft Internet Explorer' )
	http = new ActiveXObject("Microsoft.XMLHTTP");
else
	http = new XMLHttpRequest();


function switchyear(year) {
	c = document.getElementById('calendarYear');
	w = document.getElementById('calendarWait');
	c.style.display='none';
	w.style.display='block';
	
	setTimeout('switchyearFunction('+year+')', 800);
}
function switchyearFunction(year) {
	http.open('GET', base+'/calendar.php?year='+year);	
	http.onreadystatechange = handleResponseSwitchYear; 
	http.send(null);	
}
function handleResponseSwitchYear() {	
	if(http.readyState == 4 && http.status == 200)
	{ 
		if(http.responseText) { 
			document.getElementById('wrapCalendar').innerHTML = http.responseText;
		}		
	} else if(http.readyState == 4 && http.status == 404) { 
	  document.getElementById('wrapCalendar').innerHTML = "HTTP ERROR 404: <br /><br />Pagina niet gevonden"; 
	} 
}