function Submitform()
			{
			if  ((document.sub.email.value=='Indiquez votre Email') || (document.sub.email.value=='')) alert("Vous devez préciser une adresse email");
			else 
				{
				window.open('lettre_info/page_attente.html','sub','toolbar=0,location=0,directories=0,status=0,scrollbars=0,resizable=0,copyhistory=0,menuBar=0,width=500,height=370');
				document.sub.submit();
			 	}
			 }