var TREE_NODES = [
	['Research and Specialty Gas', null, null,
			['Cylinder Regulators', 'cylinderregulators.html', '_parent'],
			['Back Pressure Regulators', 'backpressureregulators.html', '_parent'],
			['Gas Distribution System', 'gasdistributionsystem.html', '_parent'],
			['Accessories', 'accessories.html', '_parent'],
			['Flow meter', 'flowmeter.html', '_parent']			
	]
];