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

var http = createRequestObject();

function sndReq(action) {
    http.open('get', 'calendar/ajax_calendar.php?mydate='+action);
	http.onreadystatechange = handleResponse;
    http.send(null);
}

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

function pick(mydate) { 
    show(); 
    document.getElementById('date_input').value = mydate; 
} 

function show() { 
    if(document.getElementById('calendar_lib_span').style.visibility == "hidden") 
        document.getElementById('calendar_lib_span').style.visibility = "visible"; 
    else 
        document.getElementById('calendar_lib_span').style.visibility = "hidden" 
}