function changeVisibiliteCalque(calqueNom, calqueEtat)
{
 if (window.document.getElementById) { calqueStyle = eval("window.document.getElementById('" + calqueNom + "').style"); }
 else if (document.layers) { calqueStyle = eval("window.document.layers['" + calqueNom + "']"); }
 else { calqueStyle = eval("window.document.all['" + calqueNom + "'].style"); }
 
 calqueStyle.visibility = calqueEtat;
}