var cad = document.getElementById("defaut");
var ca1 = document.getElementById("calque1");
var ca2 = document.getElementById("calque2");
var ca3 = document.getElementById("calque3");
var ca4 = document.getElementById("calque4");

// masque les calques 1 - 4
ca1.style.display = "none";
ca2.style.display = "none";
ca3.style.display = "none";
ca4.style.display = "none";

function cacheTout()
{
	cad.style.display = "none";
	ca1.style.display = "none";
	ca2.style.display = "none";
	ca3.style.display = "none";
	ca4.style.display = "none";
}

function afficheCalque(num)
{
	cacheTout();
	eval("ca"+num).style.display = "block";
}
function masqueCalque()
{
	cacheTout();
	cad.style.display = "block";
}