function Ajax(email){
	if(email != ''){
		if(window.XMLHttpRequest){
			xhr = new XMLHttpRequest();
		}
		else if(window.ActiveXObject){
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
				
		xhr.onreadystatechange = function(){
		alert_email(xhr);
		}
		xhr.open("GET", "/mail.php?email="+email+"",true);
		xhr.send(null);
	}
}
		
function alert_email(xhr){
	if(xhr.readyState == 4){
		if(xhr.responseText == 1){
			document.getElementById('dispo').innerHTML = "Merci, votre email a été ajouté";
		}
		else if(xhr.responseText == 0){
			document.getElementById('dispo').innerHTML = "Cet email est déjà pris";
		}
		else if(xhr.responseText == 2){
			document.getElementById('dispo').innerHTML = "Email incorrect";
		}
	}
}