function toggleTabs(tabid1, tabid2) 
{
	if (document.getElementById)
	{
		newstate = (document.getElementById(tabid1).style.visibility == 'hidden') ? 'visible' : 'hidden';
		document.getElementById(tabid1).style.visibility = newstate;
		if (tabid2 != null) {
			newstate = (document.getElementById(tabid2).style.visibility == 'hidden') ? 'visible' : 'hidden';
			document.getElementById(tabid2).style.visibility = newstate;
		}
	} 
}