// cross navigator functions

var isDOM = (document.getElementById ? true : false);
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);
var isDyn = (isDOM || isIE4 || isNS4);

function getTag(id) {
  if (isDOM) return document.getElementById(id);
  if (isIE4) return document.all[id];
  if (isNS4) return document.layers[id];
}

function getTagStyle(id) {
  return (isNS4 ? getTag(id) : getTag(id).style);
}


//*************************************************************	
// pour afficher les menus copyright artproof.net
//*************************************************************

var current = new Array();

function menu_off(level) {
   for (var i = level; i < current.length; i++) { 
           if (current[i]) {
               st = getTagStyle(current[i]);
               st.display = 'none';
               current[i] = null;
           }
      } 
}

function menu_on(name,level) {

      s = getTagStyle(name);
      if (s.display != 'block') {
          menu_off(level);
          s.display = 'block';
          current[level] = name;
      }
 
}

//*************************************************************