function imprimeur() { 
   document.getElementById("imprimeur").style.visibility="visible";
   document.getElementById("logisticien").style.visibility="hidden";
   document.getElementById("services").style.visibility="hidden";
}
function logisticien() { 
   document.getElementById("imprimeur").style.visibility="hidden";
   document.getElementById("logisticien").style.visibility="visible";
   document.getElementById("services").style.visibility="hidden";
}
function services() { 
   document.getElementById("imprimeur").style.visibility="hidden";
   document.getElementById("logisticien").style.visibility="hidden";
   document.getElementById("services").style.visibility="visible";
}
function temoignages(a,b) { 
   document.getElementById(a).style.visibility="hidden";
   document.getElementById(b).style.visibility="visible";
}
function temoignagesinit(c) { 
   document.getElementById(c).style.visibility="visible";
}