function valid_email(str) {	
	var emailexp = /^[a-z][a-z_0-9\-\.]+@[a-z_0-9\.\-]+\.[a-z]{2,3}$/i
	return emailexp.test(str);
}


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 {
	   alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
	   xhr = false; 
	} 
	return xhr;
}
			
			
function sava_adr_news(id_input_news){
	
	
	str_adr = document.getElementById(id_input_news).value;
	if (valid_email(str_adr) == false) {
		
		resultat = 'adresse e-mail incorrect';
		document.getElementById('msg').innerHTML = resultat;
		return false;
	}
	
	var xhr = getXhr_();
	xhr.onreadystatechange = function(){
		if(xhr.readyState == 4 && xhr.status == 200){
			resultat = xhr.responseText;
			document.getElementById('msg').innerHTML = resultat;
		}
	}

	xhr.open("POST","ajaxnewsletter.php",true);
	xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	xhr.send("adr_new="+str_adr);
}