function ModeModif()
        {
            var champ = document.querySelectorAll("input[type=Text]")
            for(var i=0; i<champ.length;i++)
                if(champ[i].value!="")
                {
                    champ[i].disabled = true;
                }

            var drop = document.querySelectorAll("select")
            for(var i=0; i<drop.length;i++)
                if(drop[i].selectedIndex>0)
            {
                drop[i].disabled = true;
            }

            var bout = document.getElementById("btnModif")
            bout.hidden = !bout.hidden;
        }