function env_click(envelopeid,buttonid) 
	{
	if (envelopeid.style.display == "block") 
		{
		envelopeid.style.display = "none";
		buttonid.src = "/images/mais.gif";
		}
	else 
		{
		envelopeid.style.display = "block";
		buttonid.src = "/images/menos.gif";
		}
	}