var file = "http://www.plainesdelescaut.be/newsletterBox/ajax_news.php";
  var check_delay = 250;
  var req = new CreateXMLHTTPRequestObject();

function validate(form_id,email) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.getElementById("news").value;
   if(reg.test(address) == false) {
      alert('Adresse Email invalide');
      return false;
   }
   else return true;
}
function checkResponse() { 
    var rep = req.getResponse();
    document.getElementById('news').value=rep;
    alert(rep);
    req.validateRequest();
}

function connectNews() {
  if(validate('newsletter','news'))
  {
  	req.setAsynchronous();
  
  	data="email="+document.getElementById('news').value;
  	if(!req.getFileGet(file, data)) var a=0;
  	setTimeout("checkResponse()", check_delay);
  }
}

function isEnterTouch(e){
	if(window.event){
		e = window.event;
	}
	if(e.keyCode==13){
	   //alert("enter");
	   connectNews();
	}
}