function pokaz_ukryj(A, B) {
					A=document.getElementById(A);
					B=document.getElementById(B);
					A.style.display='block';
					B.style.display='none';
				}
				
				var Menu = {
					register: function()
					{
						if (document.addEventListener) {
							document.getElementById('content').addEventListener('mouseover', Menu.hide, false);
						} else {
							document.getElementById('content').onmouseover = Menu.hide;
						}
						
						var stack = document.getElementById('menu').getElementsByTagName('li');
						for (var i = 0; i < stack.length; i++) {
							var j = i+1;
							if (document.addEventListener) {
								stack[i].addEventListener('mouseover', new Function("Menu.pick(" + j + ");"), false);
							} else {
								stack[i].onmouseover = new Function("Menu.pick(" + j + ");");
							}
						}	
					},
					
					init: function()
					{	
						window.onload = Menu.register;
					},
					
					pick: function(which)
					{
						var stack = document.getElementById('submenu').getElementsByTagName('ul');
						for (var i = 0; i < stack.length; i++) {
							stack[i].style.display = 'none';
						}
						if (document.getElementById('submenu_' + which)) {
							document.getElementById('submenu_' + which).style.display = 'block';
						}
						
						var stack = document.getElementById('menu').getElementsByTagName('li');
						for (var i = 0; i < stack.length; i++) {
							if (stack[i].className.indexOf('selected active') != -1) {
								stack[i].className = '';
							}
						}
						var el = document.getElementById('menu').getElementsByTagName('li')[which-1];
						if (el.className.indexOf('selected active') == -1) {
							el.className += 'selected active';						
						}
					},
					
					mark: function(which)
					{
						var el = document.getElementById('menu').getElementsByTagName('li')[which-1];
						if (el.className.indexOf('selected active') == -1) {
							el.className = 'selected active';
						}
						
						var stack = document.getElementById('submenu').getElementsByTagName('ul');
						for (var i = 0; i < stack.length; i++) {
							stack[i].style.display = 'none';
						}
						if (document.getElementById('submenu_' + which)) {
							document.getElementById('submenu_' + which).style.display = 'block';
						}
					},
					
					hide: function()
					{
						var stack = document.getElementById('submenu').getElementsByTagName('ul');
						for (var i = 1; i < stack.length+1; i++) {
							document.getElementById('submenu_' + (i+1)).style.display = 'none';
						}
						var stack = document.getElementById('menu').getElementsByTagName('li');
						for (var i = 1; i < stack.length; i++) {
							if (stack[i].className.indexOf('selected active') != -1) {
								stack[i].className = '';
							}
						}
					}
				}