Lukas Podolski of Arsenal celebrates scoring during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Oliver Giroud (R) of Arsenal celebrates his first goal with teammates Theo Walcott (Top) and Per Mertesacker during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Oliver Giroud (R) of Arsenal celebrates his second goal with teammate Lukas Podolski during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Oliver Giroud of Arsenal celebrates his second goal during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Oliver Giroud (1st, R) of Arsenal celebrates scoring with teammates during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Theo Walcott (L) of Arsenal celebrates scoring with teammate Oliver Giroud during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Theo Walcott (L) of Arsenal celebrates scoring with teammate Lukas Podolski during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Lukas Podolski (Bottom, R) of Arsenal celebrates scoring with teammates Santi Cazorla (Bottom, L) and Oliver Giroud during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili)

Theo Walcott (L) of Arsenal celebrates scoring with teammate Oliver Giroud during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Oliver Giroud of Arsenal celebrates his first goal during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili) 

Theo Walcott (L) of Arsenal celebrates scoring with teammate Lukas Podolski during the English Premier League football match between Arsenal and West Ham United at the Emirates Stadium in London, Britain, on Jan. 23, 2013. Arsenal won 5-1.(Xinhua/Wang Lili)