function iljhid(iljinv)
{
document.getElementById('d1').style.visibility='hidden';
document.getElementById('d2').style.visibility='hidden';
document.getElementById('d3').style.visibility='hidden';
document.getElementById('d4').style.visibility='hidden';
//document.getElementById('d5').style.visibility='hidden';
document.getElementById('d6').style.visibility='hidden';
document.getElementById('d7').style.visibility='hidden';
document.getElementById('d8').style.visibility='hidden';
document.getElementById('d9').style.visibility='hidden';
document.getElementById('d10').style.visibility='hidden';
document.getElementById('d11').style.visibility='hidden';
document.getElementById('d12').style.visibility='hidden';
document.getElementById('d13').style.visibility='hidden';
//etc
document.getElementById('contenu').style.visibility='hidden';
document.getElementById('contenu2').style.visibility='hidden';
document.getElementById('dstart').style.visibility='hidden';
document.getElementById(iljinv).style.zIndex=30;
document.getElementById('contenu').style.zIndex=32;
document.getElementById('contenu2').style.zIndex=31;
document.getElementById(iljinv).style.visibility='visible';
}