function montre(object)
{ 
if (document.layers && document.layers[object])
{ 
document.layers[object].visibility = 'visible';
} 
else if (document.all)
{
document.all[object].style.visibility = 'visible';
document.all[object].style.zIndex = 100;
}
else if (document.getElementById) 
{
document.getElementById(object).style.visibility = 'visible'; document.getElementById(object).style.zIndex = 100; 
} 
};

function cache(object)
{
if (document.layers && document.layers[object])
{ 
document.layers[object].visibility = 'hidden';
} 
else if (document.all)
{ 
document.all[object].style.visibility = 'hidden';
}
else if (document.getElementById) 
{
document.getElementById(object).style.visibility = 'hidden'; 
}
};


function montrer_choix(object) {
if (document.layers && document.layers[object])
{ 
if(document.layers[object].visibility == 'visible')
 {cache(object);}else{montre(object);}
} 
else if (document.all)
{
if(document.all[object].style.visibility == 'visible')
{cache(object);}else{montre(object);}
}
else if (document.getElementById) 
{
if(document.getElementById(object).style.visibility == 'visible')
{cache(object);}else{montre(object);}
}
};