var isNav4 = false;
var isIE = false;
var isAdv = false;
var isOpe = false;
if (document.layers) {isNav4 = true}
else if ((document.getElementById)&&(navigator.appName.indexOf("Explorer") < 0)){isAdv = true}
else {isIE = true}
if (navigator.userAgent.indexOf("Opera")!=-1){isOpe = true}

//Affichage layer
function show_layer(lay){
if (isNav4) {
document [lay].visibility='Show';
document [lay].height=320;}
if (isAdv) {
document.getElementById(lay).style.visibility='visible';
document.getElementById(lay).style.height='320px';}
else {
document.all [lay].style.visibility='Visible';
document.all [lay].style.height='320px';}
}
//Disparition layer
function hide_layer(lay){
if (isNav4) {
document [lay].visibility='Hide';
document [lay].height=0;
}
if (isAdv) {
document.getElementById(lay).style.visibility='hidden';
document.getElementById(lay).style.height='0px';}
else {
document.all [lay].style.visibility='Hidden';
document.all [lay].style.height='0px';}
}
var rd;
var nd;
var n;

function ldiapo (y) {
if (rd > 1) {rd = rd-1}
else {rd = nd;}
if (rd < 10) {n = '0'+rd;}
else {n = rd;}
document.viewp.src = y+'/'+y+n+'.jpg';
}

function ndiapo (y) {
if (rd < nd) {rd = rd+1}
else {rd = 1;}
if (rd < 10) {n = '0'+rd;}
else {n = rd;}
document.viewp.src = y+'/'+y+n+'.jpg';
}