Would you like to leave a message? <a href=" http://aiapets.com/nexium-tabletas-40-mg.pdf#mould ">cheap nexium 40 mg</a> HONG KONG, Aug 15 (Reuters) - China's biggest hypermarketchain Sun Art Retail Group Ltd is taking on Wal-MartStores Inc in the booming domestic e-commerce sector asit seeks new ways to maintain its market share in the face offierce competition.