U.S. golfer Tiger Woods smiles during a news conference as part of his Asian tour in Mission Hill Dongguan club house in Dongguan, southern China's Guangdong province, Tuesday, April 12, 2011. Woods will visit Beijing and Seoul in South Korea during the tour. (AP Photo/Kin Cheung)
South Korean environmentalists hold umbrellas beside jets of water during a rally demanding South Korean government to stop expanding nuclear power plants in Seoul, South Korea, Wednesday, April 6, 2011. Fears over possible radiation contamination are growing in South Korea, the country closest to Japan, after Japanese nuclear power plants were damaged by earthquakes last month.(AP Photo/Ahn Young-joon)
Japanese baseball fans write their "Hang in There, Japan" messages on a large banner before the start of a season opener between the Hanshin Tigers and the Hiroshima Carp at Nishinomiya, western Japan, on Tuesday April 12, 2011. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
A technician of AhnLab Inc. works against cyberattacks at the company's Security Operation Center in Seoul, South Korea, Friday, March 4, 2011. Hackers attacked about 40 South Korean government and private websites Friday, prompting officials to warn of a substantial threat to the country's computers. (AP Photo/Lee Jin-man)
A U.S. soldier from the 2nd Infantry Division wears a gas mask and anti-chemical gear during a joint U.S.-South Korea military drill for chemical, biological, radiological and nuclear detection and response capabilities at Camp Casey in Dongducheon, South Korea, north of Seoul, on Thursday, March 3, 2011. Troops from the two allies kicked off their annual drills Monday, while North Korea slammed the maneuvers as a rehearsal for an invasion of the North that could trigger a nuclear war on the divided peninsula. (AP Photo/Lee Jin-man)
**FILE** South Korean activists and defectors from North Korea release balloons with the words "Overthrow Kim Jong-il Dictatorship" in Korean and with leaflets condemning the North Korean leader during a rally at the Imjingak pavilion near the border village of Panmunjom, South Korea, on Feb. 16, the North's national holiday celebrating Mr. Kim's birthday. (Associated Press)
Treasury Secretary Timothy F. Geithner tells senators that if trade deals with South Korea, Colombia and Panama aren't approved, U.S. "business just goes to other countries." (Associated Press)
Models and LG Electronics employees wearing special glasses watch a Cinema 3-D TV by LG Electronics during a press unveiling in Seoul, South Korea, Wednesday, Feb. 16, 2011. LG Electronics says competition is heating up in the global battle to win over customers to 3-D televisions and the South Korean company thinks it has gained a key edge. (AP Photo/Ahn oung-joon)
A South Korean television station airs a program about North Korean leader Kim Jong-il's birthday, seen on a TV screen at the North Korea exhibition hall of the unification observation post in Paju, South Korea, near the border village of Panmunjom, on Tuesday, Feb. 15, 2011. North Koreans will celebrate their leader's 69th birthday Wednesday, one of the country's most important holidays. The screen reads "Magnificent, Birthday Party" in the Korean language. (AP Photo/Lee Jin-man)
