function show(id)
{
	if(showed) 
		{document.getElementById(showed).style.display='none';
		 document.getElementById('a'+showed).style.background='none';		
		}
	document.getElementById(id).style.display='block';
	document.getElementById('a'+id).style.background='url(/images/menuact.gif) left top repeat-y';
	showed=id;
}