/* Tigra Menu items structure */
var MENU_ITEMS = [
	['Beginner', 'beginner.php', null,
		['Step 1', 'beginner.php?chapter=1'],
		['Step 2', 'beginner.php?chapter=2'],
		['Step 3', 'beginner.php?chapter=3'],
		['Step 4', 'beginner.php?chapter=4'],
		['Step 5', 'beginner.php?chapter=5'],
		['Step 6', 'beginner.php?chapter=6'],
		['Step 7', 'beginner.php?chapter=7']
	],
	['Intermediate', 'intermediate.php', null,
		['Cross', 'intermediate.php?chapter=cross'],
		['F2L', 'intermediate.php?chapter=f2l', null,
			['Place corners/edges', 'intermediate.php?chapter=f2l&subchapter=1'],
			['Connected/Separated', 'intermediate.php?chapter=f2l&subchapter=2']
		],
		['OLLE', 'intermediate.php?chapter=olle'],
		['COLL', 'intermediate.php?chapter=coll', null,
			['A', 'intermediate.php?chapter=coll&subchapter=a'],
			['B', 'intermediate.php?chapter=coll&subchapter=b'],
			['C', 'intermediate.php?chapter=coll&subchapter=c'],
			['D', 'intermediate.php?chapter=coll&subchapter=d'],
			['E', 'intermediate.php?chapter=coll&subchapter=e'],
			['F', 'intermediate.php?chapter=coll&subchapter=f'],
			['G', 'intermediate.php?chapter=coll&subchapter=g'],
			['H', 'intermediate.php?chapter=coll&subchapter=h']
		],
		['PLLE', 'intermediate.php?chapter=pll']
	],
	['Advanced', 'advanced.php', null,
		['Cross', 'advanced.php?chapter=cross'],
		['F2L', 'advanced.php?chapter=f2l', null,
			['Pieces in place', 'advanced.php?chapter=f2l&subchapter=piecesinplace'],
			['Insert edge', 'advanced.php?chapter=f2l&subchapter=insertedge'],
			['Insert corner', 'advanced.php?chapter=f2l&subchapter=insertcorner'],
			['Connected', 'advanced.php?chapter=f2l&subchapter=connected'],
			['Separated', 'advanced.php?chapter=f2l&subchapter=separated']
		],
		['F2L sym', 'advanced.php?chapter=f2l_sym', null,
			['Pieces in place', 'advanced.php?chapter=f2l_sym&subchapter=piecesinplace'],
			['Insert corner', 'advanced.php?chapter=f2l_sym&subchapter=insertcorner'],
			['Insert edge', 'advanced.php?chapter=f2l_sym&subchapter=insertedge'],
			['Connected', 'advanced.php?chapter=f2l_sym&subchapter=connected'],
			['Separated', 'advanced.php?chapter=f2l_sym&subchapter=separated']
		],
		['COLL', 'advanced.php?chapter=coll'],
		['OLL', 'advanced.php?chapter=oll'],
		['PLL', 'advanced.php?chapter=pll']
	],
	['Expert', 'expert.php', null,
		['Cross', 'expert.php?chapter=cross'],
		['F2L', 'expert.php?chapter=f2l', null,
			['Empty slots', 'expert.php?chapter=f2l&subchapter=emptyslot', null,
				['Adjacent', 'expert.php?chapter=f2l&subchapter=emptyslot&level=adjacent'],
				['Diagonally', 'expert.php?chapter=f2l&subchapter=emptyslot&level=diagonally']
			],
			['Pieces stuck', 'expert.php?chapter=f2l&subchapter=stuck', null,
				['Adjacent', 'expert.php?chapter=f2l&subchapter=stuck&level=adjacent'],
				['Diagonally', 'expert.php?chapter=f2l&subchapter=stuck&level=diagonally']
			],
			['Multislotting', 'expert.php?chapter=f2l&subchapter=multislot', null,
				['L\' (R U R\') L', 'expert.php?chapter=f2l&subchapter=multislot&level=gr1'],
				['L\' (R U R\') U2 L', 'expert.php?chapter=f2l&subchapter=multislot&level=gr2'],
				['L\' (R U R\') U L', 'expert.php?chapter=f2l&subchapter=multislot&level=gr3'],
				['L\' (R U R\') U\' L', 'expert.php?chapter=f2l&subchapter=multislot&level=gr4'],
				['(R\' F R F\')', 'expert.php?chapter=f2l&subchapter=multislot&level=gr5'],
				['(R U2 R\')', 'expert.php?chapter=f2l&subchapter=multislot&level=gr6'],
				['(R U R\')', 'expert.php?chapter=f2l&subchapter=multislot&level=gr7'],
				['(R U\' R\')', 'expert.php?chapter=f2l&subchapter=multislot&level=gr8']
			],
			['Mis-aligned pairs', 'expert.php?chapter=f2l&subchapter=misaligned']
		],
		['OLL', 'expert.php?chapter=oll', null,
			['No edges & T-shapes', 'expert.php?chapter=oll&subchapter=noedgestshapes'],
			['I & Fish shapes', 'expert.php?chapter=oll&subchapter=ishapesfish'],
			['L-shapes & All corners', 'expert.php?chapter=oll&subchapter=lshapescorners'],
			['W & Square shapes', 'expert.php?chapter=oll&subchapter=wshapessquare'],
			['C-shapes & Light bolts', 'expert.php?chapter=oll&subchapter=cshapesbolts'],
			['P & Knight shapes', 'expert.php?chapter=oll&subchapter=pshapesknight'],
			['Awkward & All edges', 'expert.php?chapter=oll&subchapter=awkwardedges']
		],
		['COLL', 'expert.php?chapter=coll'],
		['LL influence', 'expert.php?chapter=llinfluence', null,
			['VH system', 'expert.php?chapter=llinfluence&subchapter=vh'],
			['ZB system', 'expert.php?chapter=llinfluence&subchapter=zb']
		],
		['Combining', 'expert.php?chapter=combining']
	]
];