Summary of significant accounting policies (Tables)

6 Months Ended

Jun. 30, 2013

Summary of significant accounting policies [Abstract]

Schedule of Depreciation Rate of Plant and Equipment

Depreciation of plant and equipment is provided using the straight-line method over their estimated useful lives at the following annual rates:

Buildings	5% - 10	%
Furniture, fixtures and office equipment	20	%
Leasehold improvement	33	%
Machinery and equipment	10	%
Motor vehicles	20	%