function changeText(r){
		
		var h	=	document.getElementById('H').style.visibility;
		var v	=	document.getElementById('V').style.visibility;

		
	if (r == "H"){
		if (h == 'hidden'){
			document.getElementById('H').style.visibility = 'visible';
			document.getElementById('V').style.visibility = 'hidden';}
		else{		
		document.getElementById('H').style.visibility = 'hidden';}
	 }
if (r == "V"){
		if (v == 'hidden'){
			document.getElementById('V').style.visibility = 'visible';
			document.getElementById('H').style.visibility = 'hidden';}
		else{		
		document.getElementById('V').style.visibility = 'hidden';}
	 }
}
	
	function menu(menu){
	
		var m	=	document.getElementById('menu').style.visibility;
		if (m == 'hidden'){
			document.getElementById('menu').style.visibility = 'visible';
		}
		else{		
		document.getElementById('menu').style.visibility = 'hidden';}
}