function ug(cond) {
	if(cond == true) {
		document.getElementById("act1").className = 'mug1 mOff';
		document.getElementById("act2").className = 'mug1 mOn';
	} else {
		document.getElementById("act1").className = 'mug1 mOn';
		document.getElementById("act2").className = 'mug1 mOff';
	}
}

function ug2( itemId )
{
	if (theItem = document.getElementById(itemId))
	{
		theItem.className = theItem.className=='mug1 mOff' ? 'mug1 mOn' : 'mug1 mOff';
	}
}

function changeVisibility( itemId )
{
	if (theItem = document.getElementById(itemId))
	{
		theItem.className = theItem.className=='yes' ? 'no' : 'yes';
	}
}