function agrandissement(img, hauteur, largeur)
{
    document.getElementById("imageAgrandie").src = img;
    document.getElementById("imageAgrandie").width = largeur;
    document.getElementById("agrandissement").style.visibility = 'visible';
    document.getElementById("fond").style.visibility = 'visible';
}
function fermer()
{
    document.getElementById("agrandissement").style.visibility = 'hidden';
    document.getElementById("fond").style.visibility = 'hidden';
}
function change(texte, id, img)
{
    document.getElementById("texte_menu").innerHTML = texte;
    document.getElementById(id).src = img;
}
function out(id, img)
{
    document.getElementById(id).src = img;
    document.getElementById("texte_menu").innerHTML = '';
}
function preload()
{
    if(document.images)
    {
        tabImages=new Array;
        for(var i=0; i<preload.arguments.lenght; i++)
        {
            tabImages[i] = new Images();
            tabImages[i].src=preload.arguments[i];
        }
    }
}
var i = 1;
    function afficheMenu()
    {
        document.getElementById('menuPicture').style.visibility = "visible";
    }
    function imagePrecedente()
    {
        var picture = "picture"+i;
        document.getElementById('picture').src = document.getElementById(picture).value;
        i--;
        if(i < 1)
        {
            i = 4;
        }
    }
    function imageSuivante()
    {
        var picture = "picture"+i;
        document.getElementById('picture').src = document.getElementById(picture).value;
        i++;
        if(i > 4)
        {
            i = 1;
        }
    }