function submenu(nrsichtbar){

// Anzahl der Submenues
	var am = 4;

	// das angeklickte Menü ausblenden, falls es aktiv (=sichtbar) ist
	if(document.getElementById('submenu' + nrsichtbar).style.visibility == 'visible'){
		//alert('bin oben');
		document.getElementById('submenu' + nrsichtbar).style.visibility = 'hidden';
		document.getElementById('submenu' + nrsichtbar).style.display = 'none';		
		document.getElementById('root_submenu1').style.visibility = 'hidden';
		document.getElementById('position_sub1').style.visibility = 'hidden';		
	}
	
	else{
		for (var n = 1; n <= am; n++){
		//alert('bin unten');
		// alles Submenüs ausblenden
		document.getElementById('submenu' + n).style.visibility = 'hidden';
		document.getElementById('submenu' + n).style.display= 'none';		
		document.getElementById('root_submenu1').style.visibility = 'hidden';
		document.getElementById('position_sub1').style.visibility = 'hidden';			 
		}
		// das gewählte Menü wieder einblenden (wurde vorher nämlich aus ausgeblendet)
		document.getElementById('submenu' + nrsichtbar).style.display = 'block';
		document.getElementById('submenu' + nrsichtbar).style.visibility = 'visible';
		document.getElementById('root_submenu1').style.visibility = 'visible';
		document.getElementById('position_sub1').style.visibility = 'visible';		 
	} // Ende else

}

function submenu_alle_aus(){
	for (var n = 1; n <= 4; n++){
		 document.getElementById('submenu' + n).style.visibility = 'hidden';
		 document.getElementById('submenu' + n).style.display = 'none';		 
		 document.getElementById('root_submenu1').style.visibility = 'hidden';			 
		 document.getElementById('position_sub1').style.visibility = 'hidden';			 		 
	 		 		 
		}
	
}