function MudaMenu(id) {
	if (id == 'principal')	{	document.getElementById('principal').src = '_img/btoPrincipalOn.jpg';	}	else	{	document.getElementById('principal').src = '_img/btoPrincipal.jpg';	}
	if (id == 'download')	{	document.getElementById('download').src = '_img/btoDownloadOn.jpg';		}	else	{	document.getElementById('download').src = '_img/btoDownload.jpg';	}
	//if (id == 'chat')		{	document.getElementById('chat').src = '_img/btoChatOn.jpg';				}	else	{	document.getElementById('chat').src = '_img/btoChat.jpg';			}
	//if (id == 'forum')		{	document.getElementById('forum').src = '_img/btoForumOn.jpg';			}	else	{	document.getElementById('forum').src = '_img/btoForum.jpg';			}
}