function send_contact() {
//window.document.forms["frm_email"]

	var v_nom= window.document.forms["frm_contact"].nom_contact.value;
	var v_tel = window.document.forms["frm_contact"].tel_contact.value;
	var v_courriel = window.document.forms["frm_contact"].courriel_contact.value;
	var v_description = window.document.forms["frm_contact"].description_contact.value;	
	
	var v_nb_personne = window.document.forms["frm_contact"].nb_personne_contact.value;
	
	var url = "include/send_mail.php";
	
	var xhr_object = null; 
	 
	if(window.XMLHttpRequest) // Firefox 
	   xhr_object = new XMLHttpRequest(); 
	else if(window.ActiveXObject) // Internet Explorer 
	   xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
	else { // XMLHttpRequest non supporté par le navigateur 
	   	alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
		//document.getElementById("msn_contact").style.visibility = "visible";
		//document.getElementById("diff_patience").style.visibility = "hidden";
	   return; 
	} 
	 
	xhr_object.open("POST",url, false); 
	xhr_object.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;");        
	
	var data = "nom=" + v_nom + "&tel=" + v_tel +  "&courriel=" + v_courriel +  "&description=" + v_description + "&nb_personne=" + v_nb_personne;
	
	xhr_object.send(data); 
	
	if(xhr_object.readyState == 4) {
		// Tout est ok
		alert('Message envoye / Message sent');
		document.getElementById('frm_contact').reset();
	}
	else {
		alert('Erreur / Error');
	}
}