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Prepayment and other current assets
6 Months Ended
Jun. 30, 2011
Prepayment and other current assets
(4) Prepayment and other current assets

Prepayment and other current assets consisted of the following:
   
June 30,
2011
   
December 31,
2010
 
Prepayment for purchase of materials
  $ 341,040     $ 158,848  
Prepaid insurance
    184,070       19,000  
Others
    23,697       6,875  
    $ 548,807     $ 184,723