// Tree structure definition
var TREE_NODES = [
                ["Water Treatment Chemicals", null, null,
                ["Boiler Chemicals", "boiler.htm", "main"],
	["Cooling Water Chemicals", "cooling.htm", "main"],
	["Chilled Water Chemical", "chilled.htm", "main"],
	["Engine Coolant",  "engine.htm", "main"],
	["Reverse Osmosis  Chemicals",  "reverse_osmosis.htm", "main"],
	             ],
	
		["Ion Exchange Resins", "resins.htm", "main"],
		["Equipments/Instruments", "equipments.htm", "main"],
];