function open_liste (id){
	
	if(document.getElementById("s_m_"+id).style.display == "block") {
		document.getElementById("s_m_"+id).style.display = "none";
	}
	else for(i = 1; i <= 3; i++) {
		if(id != i)
			document.getElementById("s_m_"+i).style.display = "none";
		else
			document.getElementById("s_m_"+i).style.display = "block";
	}
}