//creating the xml object
    
function ajaxFunction(){
    try {
        ObjRequested = new XMLHttpRequest();
    }catch(e){
        try{
        ObjRequested = new ActiveXObject("Microsoft.XMLHTTP");
        }catch(e){
            window.alert("Não foi possível criar o objeto XML.");
        }
    }
    return ObjRequested;
}

ObjRequest = ajaxFunction();

//loading the page

function loadPage(pageValue){

    var url = pageValue;

    ObjRequest.open ("GET", url, true);
    ObjRequest.onreadystatechange = changeStatus; 
    ObjRequest.send(null);

    if(ObjRequest.readyState == 1){
        document.getElementById("content").innerHTML = "<img src='loader.gif' alt='loader'/>";
    }

    return url;

}

function changeStatus(){

    if (ObjRequest.readyState == 4){
        document.getElementById("content").innerHTML = ObjRequest.responseText;
    }

}