function visibilite(thingId)
{
 var i;
 var targetElement;
 targetElement = document.getElementById("divid" + thingId) ;
 if ( targetElement.style.display == "none") 
     targetElement.style.display = "" ;
 else
     targetElement.style.display = "none" ;
}


function show(_show){
    var disp = (_show)? "" : "none";
    for ( var i=1; i<25; i++){
       document.getElementById("divid" + i).style.display = disp;
    }
}