function affiche(element){
var visible=document.getElementById(element).style.visibility;

if (element=='photo1'){
document.getElementById('photo1').style.visibility="visible";
document.getElementById('photo2').style.visibility="hidden";
document.getElementById('photo3').style.visibility="hidden";
document.getElementById('photo4').style.visibility="hidden";
document.getElementById('photo5').style.visibility="hidden";
document.getElementById('photo6').style.visibility="hidden";
}

if (element=='photo2'){
document.getElementById('photo1').style.visibility="hidden";
document.getElementById('photo2').style.visibility="visible";
document.getElementById('photo3').style.visibility="hidden";
document.getElementById('photo4').style.visibility="hidden";
document.getElementById('photo5').style.visibility="hidden";
document.getElementById('photo6').style.visibility="hidden";
}

if (element=='photo3'){
document.getElementById('photo1').style.visibility="hidden";
document.getElementById('photo2').style.visibility="hidden";
document.getElementById('photo3').style.visibility="visible";
document.getElementById('photo4').style.visibility="hidden";
document.getElementById('photo5').style.visibility="hidden";
document.getElementById('photo6').style.visibility="hidden";
}

if (element=='photo4'){
document.getElementById('photo1').style.visibility="hidden";
document.getElementById('photo2').style.visibility="hidden";
document.getElementById('photo3').style.visibility="hidden";
document.getElementById('photo4').style.visibility="visible";
document.getElementById('photo5').style.visibility="hidden";
document.getElementById('photo6').style.visibility="hidden";
}

if (element=='photo5'){
document.getElementById('photo1').style.visibility="hidden";
document.getElementById('photo2').style.visibility="hidden";
document.getElementById('photo3').style.visibility="hidden";
document.getElementById('photo4').style.visibility="hidden";
document.getElementById('photo5').style.visibility="visible";
document.getElementById('photo6').style.visibility="hidden";
}

if (element=='photo6'){
document.getElementById('photo1').style.visibility="hidden";
document.getElementById('photo2').style.visibility="hidden";
document.getElementById('photo3').style.visibility="hidden";
document.getElementById('photo4').style.visibility="hidden";
document.getElementById('photo5').style.visibility="hidden";
document.getElementById('photo6').style.visibility="visible";
}


}

function turnImgCheck(objCheck)
{
    var img = document.getElementById('img_check_' + objCheck.id);
    var t = img.src.split('/');
    img.src = (t[t.length-1] == 'images/check2.gif') ? 'images/check1.gif' : 'images/check2.gif';
}