function bouton(){	
		document.getElementById("alert").style.visibility = "visible"
		document.getElementById("alert").setAttribute("style","display:block;color:red;font-size:11px;")
		document.getElementById("alert").innerHTML = alerter	
}
function no_bouton(){	
		document.getElementById("alert").style.visibility = "hidden"
		document.getElementById("alert").setAttribute("style","display:block;color:red;font-size:11px;")
		document.getElementById("alert").innerHTML = alerter
}