var http = createRequestObject();
function createRequestObject(){
    var request_;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        request_ = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else{
        request_ = new XMLHttpRequest();
    }
    return request_;
}
function getInfo(){
    http.open('get', 'calendar/show_cal.php?page=calllllllllll&id='+ document.myform.x_on.value);
    http.onreadystatechange = handleInfo;
    http.send(null);
}
function handleInfo(){
    if(http.readyState == 1){
        document.getElementById('mydiv').innerHTML = '<img src="calendar/images/loading.gif">تحميل...';
    }
    if(http.readyState == 4){
        var response = http.responseText;
        document.getElementById('mydiv').innerHTML = response;
    }
}