function _gm_upd_Group(type)
	{
	for (var i = 0; i < _gm_mg[type].length; i++)
		{
		var marca = _gm_mg[type][i];
		if (marca.isHidden()) { marca.show(); } 
			else { marca.hide(); }
		} 
	}

function _gm_upd_labels()
	{
	var showLabels = document.getElementById("labelsCheckbox").checked;
	for (groupName in _gm_mg)
		{
		for (var i = 0; i < _gm_mg[groupName].length; i++)
			{
			var marker = _gm_mg[groupName][i];
			marker.setLabelVisibility(showLabels);
			}
		}
	}