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_det1.style.display='block'; 
           document.all.Layer_det2.style.display='none'; 
    } 
    else 
    { 
           document.getElementById('Layer_det1').style.visibility='visible';
           document.getElementById('Layer_det2').style.visibility='hidden';
		   document.getElementById('Layer_det1').style.display='block';
           document.getElementById('Layer_det2').style.display='none';
	} 
                 ;} 

// -----------------------------                 
                 
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_det1.style.display='none'; 
           document.all.Layer_det2.style.display='block';
    } 
    else 
    { 
           document.getElementById('Layer_det1').style.visibility='hidden';
           document.getElementById('Layer_det2').style.visibility='visible';
		   document.getElementById('Layer_det1').style.display='none';
           document.getElementById('Layer_det2').style.display='block';
	 } 
                 ;}
// ----------------------------- 


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_det1.style.display='none'; 
           document.all.Layer_det2.style.display='none';
	 } 
    else 
    { 
           document.getElementById('Layer_det1').style.visibility='hidden';
           document.getElementById('Layer_det2').style.visibility='hidden';
		   document.getElementById('Layer_det1').style.display='none';
           document.getElementById('Layer_det2').style.display='none';
	} 
                 ;} 
// -----------------------------