function newAjax(){
    var xmlhttp=false;
    try {
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
        try {
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (E) {
            xmlhttp = false;
        }
    }

    if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
        xmlhttp = new XMLHttpRequest();
    }
    return xmlhttp;
}

function sendAjax(url,id_container){
    var container;
    container = document.getElementById(id_container);
    ajax=newAjax();
    ajax.open("GET", url,true);
    ajax.onreadystatechange=function() {
        if (ajax.readyState==4) {
            container.innerHTML = ajax.responseText
        }
    }
    ajax.send(null)
}