function show_menu(idecko,uroven)
{
	var uroven = "level"+uroven;
	var mdiv = document.getElementById('menu_'+idecko);
	var divy = mdiv.getElementsByTagName('div');
	for(var i=0;i<divy.length;i++)
	{
		if(divy[i].className == uroven)
		{
			divy[i].style.display='block';
		}
	}
}

function zavri_menu()
{
	var divy = document.getElementsByTagName('div');
	for(var i=0;i<divy.length;i++)
	{
		if(divy[i].className == 'level2' || divy[i].className == 'level3')
		{
			divy[i].style.display='none';
		}
	}
}