function checkVisible(obj) {
	if(document.getElementById(obj).style.display=="")
		document.getElementById(obj).style.display="none";
	else
		document.getElementById(obj).style.display="";
}

function invisible(obj) {
	document.getElementById(obj).style.display="none";
}

function visible(obj) {
	document.getElementById(obj).style.display="block";
}

function classeur(pan, feuillets) {	
	for (i=0; i<feuillets.length; i++) 
		invisible(feuillets[i]);
	checkVisible(pan);
}

function viderChamp(idChamp, txt) {
	if(document.getElementById(idChamp).value == txt) { 
		document.getElementById(idChamp).value = "";
	}
}

function remplirChamp(idChamp, txt) {
	if(document.getElementById(idChamp).value == "") {
		document.getElementById(idChamp).value = txt;
	}
}