// Fichier JScript

function showhide(open) {

    
    if (open){
        document.getElementById("span1").style.display="block";
        document.getElementById("a1").style.visibility="hidden";
        document.getElementById("a2").style.visibility="visible";
        //document.getElementById("lay1").style.display="block";
    }else{
        document.getElementById("span1").style.display="none";
        document.getElementById("a1").style.visibility="visible";
        document.getElementById("a2").style.visibility="hidden";
        //document.getElementById("lay1").style.display="block";
    }
   
}