function addEvent(ou, eventName, quoi) {
if (ou.addEventListener)
ou.addEventListener(eventName, quoi, false);
else if (ou.attachEvent)
ou.attachEvent('on'+ eventName, quoi);
}

function afficherCode(id) {
var blocId= "Bloc_" + id;
if (document.getElementById(blocId)) { document.getElementById(blocId).style.display="block"; }
}

function cacherCode(id) {
var blocId= "Bloc_" + id;
if (document.getElementById(blocId)) { document.getElementById(blocId).style.display="none"; }
}

function voir(id1) {
	for (var i = 0; i<=18; i++) {
	cacherCode(i);
	}
if (id1>0) { afficherCode(id1); }
}
function init() {
	for (var i = 0; i<=18; i++) {
	cacherCode(i);
	}
afficherCode(0); 
}

addEvent(window, "load", init);


function ouvrirplan()
{
	open("plan.htm", "petite", "height=500,width=500");
}