function masquSearch()
{
var aSearch = document.getElementById("btoSearch");
var bSearch = document.getElementById("btxSearch"); 
var cSearch = document.getElementById("tabSearch");   
aSearch.style.display = "block";
bSearch.style.display = "none";
cSearch.style.display = "none";
}
function masquLogin()
{
var aLogin = document.getElementById("btoLogin");
var bLogin = document.getElementById("btxLogin");
var cLogin = document.getElementById("tabLogin");
aLogin.style.display = "block";
bLogin.style.display = "none";
cLogin.style.display = "none";
}
function masquLetter()
{ 
var aLetter = document.getElementById("btoLetter");
var bLetter = document.getElementById("btxLetter"); 
var cLetter = document.getElementById("tabLetter");   
aLetter.style.display = "block"; 
bLetter.style.display = "none"; 
cLetter.style.display = "none"; 
}
function affichSearch()
{ 
var aSearch = document.getElementById("btoSearch");
var bSearch = document.getElementById("btxSearch"); 
var cSearch = document.getElementById("tabSearch");   
aSearch.style.display = "none"; 
bSearch.style.display = "block"; 
cSearch.style.display = "block";
}
function affichLogin()
{
var aLogin = document.getElementById("btoLogin");
var bLogin = document.getElementById("btxLogin"); 
var cLogin = document.getElementById("tabLogin");   
aLogin.style.display = "none"; 
bLogin.style.display = "block"; 
cLogin.style.display = "block"; 
}
function affichLetter()
{
var aLetter = document.getElementById("btoLetter");
var bLetter = document.getElementById("btxLetter");
var cLetter = document.getElementById("tabLetter");
aLetter.style.display = "none";
bLetter.style.display = "block";
cLetter.style.display = "block";
}