function show(nom){
    if(document.getElementById(nom).style.display == '')
        document.getElementById(nom).style.display = 'none';
    else
        document.getElementById(nom).style.display = '';
}

function setImageTableau(newposition){
    show("galerie_"+position);
    position = newposition;
    show("galerie_"+position);
    
    document.getElementById("menu_galerie").innerHTML = document.getElementById("galerie_menu_"+position).innerHTML;
    document.getElementById("info_tableau").innerHTML = document.getElementById("galerie_info_"+position).innerHTML;
}

function suivant(){
    if(position < nbTableau - 1 ){
        show("galerie_"+position);
        position++;
        show("galerie_"+position);
        document.getElementById("menu_galerie").innerHTML = document.getElementById("galerie_menu_"+position).innerHTML;
        document.getElementById("info_tableau").innerHTML = document.getElementById("galerie_info_"+position).innerHTML;
    }
}

function precedent(){
    if(position>0){
        show("galerie_"+position);
        position--;
        show("galerie_"+position);
        document.getElementById("menu_galerie").innerHTML = document.getElementById("galerie_menu_"+position).innerHTML;
        document.getElementById("info_tableau").innerHTML = document.getElementById("galerie_info_"+position).innerHTML;
    }
}