function createObject() {
	var request_type;
	var browser = navigator.appName;
	if(browser == "Microsoft Internet Explorer"){
		request_type = new ActiveXObject("Microsoft.XMLHTTP");
	}else{
		request_type = new XMLHttpRequest();
	}
	return request_type;
}

var http = createObject();

function contacteur() {
	
	// Required: verify that all fileds is not empty. Use encodeURI() to solve some issues about character encoding.
	var nom = document.forms[0].nom.value;
	var prenom = document.forms[0].prenom.value;
	var telephone = document.forms[0].telephone.value;
	var mail = document.forms[0].mail.value;
	var adresse = document.forms[0].adresse.value;
	var message = document.forms[0].message.value;
	
	var data = 'nom='+nom+'&prenom='+prenom+'&telephone='+telephone+'&mmail='+mail+'&adresse='+adresse+'&message='+message;
	
	//Optional: Show a waiting message in the layer with ID ajax_response
	document.getElementById('form_contact').innerHTML = "<br/><br/><br/><br/><br/><center><img src='imgs/loader.gif' border='0'></center>";
	
	http.onreadystatechange = function(){ 
        if(http.readyState == 4){
        	if(http.status == 200){
            	document.getElementById('form_contact').innerHTML = "<br/><br/><br/><br/><b>Le message a bien &eacute;t&eacute; envoy&eacute; !</b> <br/><br/> Notre &eacute;quipe vous r&eacute;pondra dans les plus brefs d&eacute;lais.";
            }else{
               document.getElementById('form_contact').innerHTML = "<br/><br/><br/><br/><b>Oups...</b> <br/><br/> Une erreur est suvenue, merci de nous re-contacter ult&eacute;rieurment...";
           	}	
        }
	};
	
	http.open('POST', 'envoi.php', true);
	http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	http.send(data);
}