function closesubs()
{
		if(document.getElementById('firmenprofilsub'))
		{
			if(document.getElementById('firmenprofilsub').style.visibility!='hidden')
			{
				document.getElementById('firmenprofilsub').style.visibility='hidden';
			}
		}
		if(document.getElementById('referenzensub'))
		{
			if(document.getElementById('referenzensub').style.visibility!='hidden')
			{
				document.getElementById('referenzensub').style.visibility='hidden';
			}
		}
}

function opensub(subid)
{
	closesubs();
	if(document.getElementById(subid))
	{
		document.getElementById(subid).style.visibility='visible';
	}
}