function einblenden(id)
{
	if (document.getElementById(id).style.visibility == 'hidden')
	{
	document.getElementById(id).style.visibility='visible';
	}
	else
	{
	document.getElementById(id).style.visibility='visible';
	}
}
function ausblenden(id)
{
	if (document.getElementById(id).style.visibility == 'visible')
	{
	document.getElementById(id).style.visibility='hidden';
	}
	else
	{
	document.getElementById(id).style.visibility='hidden';
	}
}