function toggleLayer(whichLayer, flag)
{
	if (document.getElementById)
		var style = document.getElementById(whichLayer).style;
	style.display = (flag == '') ? 'none' : 'block';
}

function openCloseLayer(whichLayer)
{
	if (document.getElementById)
		var style = document.getElementById(whichLayer).style;
	else if (document.all)
		var style = document.all[whichLayer].style;
	else if (document.layers)
		var style = document.layers[whichLayer].style;
	style.display = style.display == 'none' ? 'block' : 'none';
}