function montre1() { 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer1.style.visibility='visible'; 
           document.all.Layer2.style.visibility='hidden';
           document.all.Layer3.style.visibility='hidden';
                   
    } 
    else 
    { 
           document.getElementById('Layer1').style.visibility='visible';
           document.getElementById('Layer2').style.visibility='hidden';
           document.getElementById('Layer3').style.visibility='hidden';
     
    } 
                 ;} 
// -----------------------------                 
                 
function montre2() {  
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer1.style.visibility='hidden'; 
           document.all.Layer2.style.visibility='visible';
           document.all.Layer3.style.visibility='hidden';
                   
    } 
    else 
    { 
           document.getElementById('Layer1').style.visibility='hidden';
           document.getElementById('Layer2').style.visibility='visible';
           document.getElementById('Layer3').style.visibility='hidden';
     
    } 
                 ;}   
// -----------------------------      
function montre3() { 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer1.style.visibility='hidden'; 
           document.all.Layer2.style.visibility='hidden';
           document.all.Layer3.style.visibility='visible';
                  
    } 
    else 
    { 
           document.getElementById('Layer1').style.visibility='hidden';
           document.getElementById('Layer2').style.visibility='hidden';
           document.getElementById('Layer3').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';
           document.all.Layer3.style.visibility='hidden';

 
    } 
    else 
    { 
           document.getElementById('Layer1').style.visibility='hidden';
           document.getElementById('Layer2').style.visibility='hidden';
           document.getElementById('Layer3').style.visibility='hidden';


    } 
                 ;} 

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