function show_sub(spn)
{
	var spn_par = spn.parentNode;

	if (spn_par.className == 'active')
	{
		spn_par.className='';

		var submenu = spn_par.childNodes;
		for (var i=0; i<submenu.length; i++)
		{
			if (submenu[i].tagName == 'UL')
			{
				submenu[i].style.display = 'none';
			}
		}
	}
	else
	{
		spn_par.className='active';

		var submenu = spn_par.childNodes;
		for (var i=0; i<submenu.length; i++)
		{
			if (submenu[i].tagName == 'UL')
			{
				submenu[i].style.display = 'block';
			}
		}
	}
}