function menu (u){

	if( u == '1' )
		{
		document.getElementById('menu_hidden_ent').style.visibility = 'visible' ;
		document.getElementById('cache_ent').style.visibility = 'visible' ;
		document.getElementById('menu_hidden_int').style.visibility = 'hidden' ;
		document.getElementById('cache_int').style.visibility = 'hidden' ;
		}
	if( u == '2' )
		{
		
		}
	if( u == '3' )
		{
		document.getElementById('menu_hidden_int').style.visibility = 'visible' ;
		document.getElementById('cache_int').style.visibility = 'visible' ;
		 document.getElementById('menu_hidden_ent').style.visibility = 'hidden' ;
		document.getElementById('cache_ent').style.visibility = 'hidden' ;
		}
	if( u == '4' )
		{
		
		}	
}