function fenetreCent(url,largeur,hauteur) 
{
var haut=(screen.height-hauteur)/2;
var Gauche=(screen.width-largeur)/2;
f=window.open(url,"","top="+haut+",left="+Gauche+",width="+largeur+",height="+hauteur+",menubar=no,scrollbars=no,statusbar=no");
}


function deb( rr)
{
	bout = rr;
}

function bouton(tt)
{	

	for (i = 1; i<=bout ; i++)
	
	{ 
	var code="annonce" + i;
	
	var a = document.getElementById(code);
			
	a.style.visibility="hidden"; 
	}
	
	var x = document.getElementById(tt);
	
	x.style.visibility="visible";
}
 

 
     function revient(zon)

{	
	var x = document.getElementById(zon);
	
	x.style.visibility="visible";

 }
 
 
function montre(dep,arr,tt,cd)

 {
	var d = document.getElementById(dep);  

	var a = document.getElementById(arr);
	
	var x = document.getElementById(tt);
	
	a.style.visibility="visible";
	
	d.style.visibility="hidden"; 
	
	
	
	if (cd =='1') 
	{
   	x.style.visibility="hidden";   
	}              
	else 
	{
	x.style.visibility="visible";
	}  
	
}