function ajax()
{
    var xhr=null;

    if (window.XMLHttpRequest) {
        xhr = new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
        xhr = new ActiveXObject("Microsoft.XMLHTTP");
    }
    //on definit l'appel de la fonction au retour serveur
    xhr.onreadystatechange = function() { alert_ajax(xhr); };


    xhr.open("POST", ROOTURL+"/ajax/gds.php", true);
	xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');


    Login_erreurMsg = document.getElementById("erreurMsg");

	emailLogin = document.getElementById("emailLogin").value;
	pwdLogin = document.getElementById("pwdLogin").value;


	if(emailLogin == "")
	{
		alert(Login_Empty);
	}
	else{

		if(pwdLogin == "")
		{
			alert(Pwd_Empty);
		}
		else{
			xhr.send("emailLogin="+emailLogin);
		}


	}


}

function hideErreur(elementId)
{
	document.getElementById(elementId).className="erreurMsgOff";
}

function alert_ajax(xhr)
{

	Login_erreurMsg = document.getElementById("erreurMsg");

	if (xhr.readyState==4)
    {
    	var docXML= xhr.responseXML;
    	var items = docXML.getElementsByTagName("donnee")

		gds = items.item(0).firstChild.data;

		if(gds == 0)
		{
			document.getElementById("hashLogin").value = hex_sha1(gds+document.getElementById("pwdLogin").value+gds);



		Login_erreurMsg.className="erreurMsgOn";
		Login_erreurMsg.innerHTML = "... Connecting ...";
		document.getElementById("pwdLogin").value = "emptypwd";

		setTimeout("hideErreur('erreurMsg');", 100200);
		document.getElementById("formLogin").submit();
		}
		else{

		if(gds == 1)
		{
			alert(Valid_NickName);
		}
		else{

		document.getElementById("hashLogin").value = hex_sha1(gds+document.getElementById("pwdLogin").value+gds);


		Login_erreurMsg.className="erreurMsgOn";
		Login_erreurMsg.innerHTML = "... Connecting ...";
		document.getElementById("pwdLogin").value = "emptypwd";

		setTimeout("hideErreur('erreurMsg');", 100200);
		document.getElementById("formLogin").submit();

		}
		}
    }
}