function setMenuDeroulant(navRoot){
   for (i=0; i < navRoot.childNodes.length; i++) {
	   node = navRoot.childNodes[i];
	   var j =0;
	   while(( j <  node.childNodes.length) && (node.nodeName != "LI") ){
		node = node.chilNodes[j];
		j++;
	   }
	   if (node.nodeName=="LI" /*&& node.childNodes[1].nodeName=="UL"*/) {
		node.onmouseover = function() {
			
			
			var uls = document.getElementById('nav').getElementsByTagName('UL')
			for (var n=0; n <  uls.length; n++){
			 	if (this != uls[n].parentNode){
					uls[n].style.display = 'none';
					uls[n].style.visibility = 'hidden';//ajout pour Opera 8.5
				}else{
					uls[n].style.display = 'block';
					uls[n].style.visibility = 'visible';//ajout pour Opera 8.5
					var imgs = this.getElementsByTagName('img');
					if (imgs[0]){
						imgs[0].src = cheminRelatif +  cheminImages + imgs[0].name.substr(1,2) + 'b.gif' ;
					}
				}
			}

		 
		}
		node.onmouseout=function() {
			 var uls = this.getElementsByTagName('UL');
			 if (uls.length > 0){
			  	 uls[0].style.display = 'none';
				 // on remet l'image à l'etat normal
				 var imgs = this.getElementsByTagName('img');
				 if (imgs[0]){
				 	if (currentMenu != imgs[0].name.substr(2,1))	
						imgs[0].src = cheminRelatif +  cheminImages + imgs[0].name.substr(1,2) + '.gif' ;
				 }				
			 }
			 if (currentMenu != ''){	
				 var uls = document.getElementById('menu' + currentMenu).getElementsByTagName('UL');
				 if (uls.length > 0) {
				 	uls[0].style.display = 'block';
			 		uls[0].style.visibility = 'visible';//ajout pour Opera 8.5			
				}
			 }

		}
		
	   }
  }
}

function startMenuDeroulant() {
 if (document.getElementById ) {
      if (document.getElementById("nav")){	
		setMenuDeroulant(document.getElementById("nav"));
		if (currentMenu != ''){
			var imgs = document.getElementById('menu' + currentMenu).getElementsByTagName('img');
			imgs[0].src = cheminRelatif +  cheminImages + '0' + currentMenu + 'b.gif';	
		}
		
	}
 }
}