function show_demande() {
	document.getElementById("Demande").style.display = 'block';
}

function hide_demande() {
	document.getElementById("Demande").style.display = 'none';
}

function getXhr() {
    var xhr = null; 
	if(window.XMLHttpRequest) // Firefox et autres
	   xhr = new XMLHttpRequest(); 
	else if(window.ActiveXObject){ // Internet Explorer 
	   try {
            xhr = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            xhr = new ActiveXObject("Microsoft.XMLHTTP");
        }
	} else { // XMLHttpRequest non supporte par le navigateur 
	   alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
	   xhr = false; 
	} 
    return xhr;
}

function sendDemande () {
	email = document.getElementById("Email").value;
	var xhr = getXhr();
	xhr.onreadystatechange = function(){
		if(xhr.readyState == 4 && xhr.status == 200){
			document.getElementById("Demande").innerHTML = xhr.responseText;
		}
	}
	xhr.open("POST","ajax.php",true);
	xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	xhr.send("email="+email);
}