var oldLettre;
 
function displayInfo(lettre){
	
	if (oldLettre) {
		document.getElementById("lettre_" + oldLettre).style.display="none";
		document.getElementById("lien_lettre_" + oldLettre).className="";
	}
	
	document.getElementById("tab_alphabet").style.display="block";
	document.getElementById("lettre_" + lettre).style.display="block";
	document.getElementById("lien_lettre_" + lettre).className="selected";
	
	oldLettre = lettre;
}