function montre1() { 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer2.style.visibility='hidden'; 
           document.all.Layer1.style.visibility='visible'; 
           
    } 
    else 
    { 
           document.getElementById('Layer2').style.visibility='hidden';
           document.getElementById('Layer1').style.visibility='visible';
           
    } 
                 ;} 
// -----------------------------                 
                 
function montre2() { 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer1.style.visibility='hidden'; 
           document.all.Layer2.style.visibility='visible'; 
           
    } 
    else 
    { 
           document.getElementById('Layer1').style.visibility='hidden';
           document.getElementById('Layer2').style.visibility='visible';
           
    } 
                 ;}  

                 
// -----------------------------                 
                 
function cache() { // pour faire disparaitre les DIV 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer1.style.visibility='hidden';
           document.all.Layer2.style.visibility='hidden'; 
    } 
    else 
    { 
           document.getElementById('Layer1').style.visibility='hidden';
           document.getElementById('Layer2').style.visibility='hidden';
    } 
                 ;} 

// -----------------------------