function afficher(id, largeurZone)
    {
        var largeurSite = 1003
        var oImage = document.getElementById(id);
        if (oImage.style.display != 'block')
        {
            oImage.style.display = 'block';
            oImage.style.left = (largeurSite - largeurZone) / 2 + 'px';
        }
        else
        {
            oImage.style.display = 'none';
        }
    }
    
function afficherPhoto(id,flag)
    {
        var oFlag = parseInt(document.getElementById(flag).value);
        var oImage = document.getElementById(id);
        if (oImage.style.display != 'block')
        {
            if (oFlag == 0)
            {
                oImage.style.display = 'block';
                document.getElementById(flag).value = 1;
            }
        }
        else
        {
            oImage.style.display = 'none';
            document.getElementById(flag).value = 0;
        }
    }