function MenuPhVisible_niveau_a() // visible accueil
{		
	MenuPh_niveau_b();
	MenuPh_niveau_c();
	MenuPh_niveau_d();			
	MenuPh_niveau_f();	
	MenuPh_niveau_g();				
	MenuPh_niveau_h();
	MenuTextInit();
	MenuTextAccueil();
	Menu_niveau_aide();
	
	if (nc4)
  { 	    	   	     	 	
  	 	document.photo1a.visibility = "visible";	    		   
  	 	document.photo3a.visibility = "visible";
  	 	document.photo5a.visibility = "visible";  	 	
  }
	if (ie4) 
	{	   	   	   	
	   	photo1a.style.visibility = "visible";
	   	photo3a.style.visibility = "visible";
	   	photo5a.style.visibility = "visible";	   		   	   			  	   		 
	 }  	
	if (nc6) 
	{	   	   				
			document.getElementById("photo1a").style.visibility = "visible";	
			document.getElementById("photo3a").style.visibility = "visible";	
			document.getElementById("photo5a").style.visibility = "visible";	
			
	}
}