function VersionNavigateur(Netscape, Explorer) {
  if ((navigator.appVersion.substring(0,3) >= Netscape && navigator.appName == 'Netscape') ||      
      (navigator.appVersion.substring(0,3) >= Explorer && navigator.appName.substring(0,9) == 'Microsoft'))
    return true;
else return false;
}

function montre_det1() { 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer_det1.style.visibility='visible'; 
           document.all.Layer_det2.style.visibility='hidden';
           document.all.Layer_det3.style.visibility='hidden';
                   
    } 
    else 
    { 
           document.getElementById('Layer_det1').style.visibility='visible';
           document.getElementById('Layer_det2').style.visibility='hidden';
           document.getElementById('Layer_det3').style.visibility='hidden';
     
    } 
                 ;} 
// -----------------------------                 
                 
function montre_det2() {  
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer_det1.style.visibility='hidden'; 
           document.all.Layer_det2.style.visibility='visible';
           document.all.Layer_det3.style.visibility='hidden';
                   
    } 
    else 
    { 
           document.getElementById('Layer_det1').style.visibility='hidden';
           document.getElementById('Layer_det2').style.visibility='visible';
           document.getElementById('Layer_det3').style.visibility='hidden';
     
    } 
                 ;}   
// -----------------------------      
function montre_det3() { 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer_det1.style.visibility='hidden'; 
           document.all.Layer_det2.style.visibility='hidden';
           document.all.Layer_det3.style.visibility='visible';
                  
    } 
    else 
    { 
           document.getElementById('Layer_det1').style.visibility='hidden';
           document.getElementById('Layer_det2').style.visibility='hidden';
           document.getElementById('Layer_det3').style.visibility='visible';
      
    } 
                 ;} 
                 
// -----------------------------    
  
              
function cache_det() { // pour faire disparaitre les DIV 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer_det1.style.visibility='hidden';
           document.all.Layer_det2.style.visibility='hidden';
           document.all.Layer_det3.style.visibility='hidden';

 
    } 
    else 
    { 
           document.getElementById('Layer_det1').style.visibility='hidden';
           document.getElementById('Layer_det2').style.visibility='hidden';
           document.getElementById('Layer_det3').style.visibility='hidden';


    } 
                 ;} 

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


function montreimg1() { 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer_img1.style.visibility='visible'; 
           document.all.Layer_img2.style.visibility='visible'; 
           document.all.Layer_img3.style.visibility='hidden';                 
    } 
    else 
    { 
           document.getElementById('Layer_img1').style.visibility='visible';
           document.getElementById('Layer_img2').style.visibility='visible';
           document.getElementById('Layer_img3').style.visibility='hidden';     
    } 
                 ;} 
// -----------------------------                 
                 



function cacheimg2() { // pour faire disparaitre les DIV 
    if (navigator.appName=='Microsoft Internet Explorer') 
    { 
           document.all.Layer_img1.style.visibility='hidden';
           document.all.Layer_img2.style.visibility='hidden';
           document.all.Layer_img3.style.visibility='visible'; 
    } 
    else 
    { 
           document.getElementById('Layer_img1').style.visibility='hidden';
           document.getElementById('Layer_img2').style.visibility='hidden';
           document.getElementById('Layer_img3').style.visibility='visible';
    } 
                 ;} 

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