function check_input()
{
	var temp=0; 
	var message_alert = "";
	for(var i = 0; i < window.document.forms[0].length ; i++) 
	{
		var rechRapide = window.document.forms[0].elements[i].value;
		var nom_champ = window.document.forms[0].elements[i].name;
		window.document.forms[0].elements[i].style.backgroundColor = "#FFFFFF";  


		if(nom_champ == "email") {
			if(rechRapide == "") {
				message_alert +=" Veuillez indiquer votre email" +"\n";
				window.document.forms[0].elements[i].focus();
				window.document.forms[0].elements[i].style.backgroundColor = "#CCCCCC";
			}
		}

		if(nom_champ == "description") { if(rechRapide == "") {
			message_alert +=" Veuillez préciser votre demande" +"\n";
			window.document.forms[0].elements[i].focus();
			window.document.forms[0].elements[i].style.backgroundColor = "#CCCCCC";
		}
		}

	}

	if (message_alert == "") {return true;} 
	else {     
		message_alert = "Informations omises dans le formulaire : \n" + message_alert;
		alert(message_alert);
			return false;
	}
}