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Open Image ModalAn ultra Orthodox Jewish man visits the Yad Vashem Holocaust Museum in Jerusalem, Wednesday, April 18, 2012. Israel will be marking its annual remembrance day for the six million Jews killed by the Nazis in World War II on Thursday. (AP Photo/Ariel Schalit) (credit:AP)
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Open Image ModalAn ultra Orthodox Jewish man looks at a pile of books on display at the Yad Vashem Holocaust Museum in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Ariel Schalit) (credit:AP)
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Open Image ModalTwo ultra Orthodox Jewish men visit the Yad Vashem Holocaust Museum in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Ariel Schalit) (credit:AP)
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Open Image ModalTwo ultra Orthodox Jewish men visit the Yad Vashem Holocaust Museum in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Ariel Schalit) (credit:AP)
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Open Image ModalA Holocaust survivor lays flowers next to the names of concentration camps during the annual ceremony on Holocaust Remembrance Day at the Yad Vashem memorial in Jerusalem, Thursday, April 19, 2012. Israel is marking its annual remembrance day for the six million Jews killed by the Nazis in World War II. (AP Photo/Ariel Schalit) (credit:AP)
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Open Image ModalIsraelis pause during a two-minute siren in memory of victims of the Holocaust in the market in Jerusalem, Thursday, April 19, 2012. (AP Photo/Bernat Armangue) (credit:AP)
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Open Image ModalIsraelis pause during a two-minute siren in memory of victims of the Holocaust in the market in Jerusalem, Thursday, April 19, 2012. (AP Photo/Bernat Armangue) (credit:AP)
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Open Image ModalIsraelis attend the opening ceremony of Holocaust Martyrs and Heroes Remembrance Day at the Yad Vashem Holocaust Memorial in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Sebastian Scheiner) (credit:AP)
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Open Image ModalIsraelis attend the opening ceremony of Holocaust Martyrs and Heroes Remembrance Day at the Yad Vashem Holocaust Memorial in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Sebastian Scheiner) (credit:AP)
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Open Image ModalIsraeli soldiers stand at attention during the opening ceremony of Holocaust Martyrs and Heroes Remembrance Day at the Yad Vashem Holocaust Memorial in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Sebastian Scheiner) (credit:AP)
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Open Image ModalIsraeli Prime Minister Benjamin Netanyahu attends the opening ceremony of the Holocaust Martyrs and Heroes Remembrance Day at the Yad Vashem Holocaust Memorial in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Sebastian Scheiner) (credit:AP)
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Open Image ModalIsraeli Prime Minister Benjamin Netanyahu speaks at the opening ceremony of Holocaust Martyrs and Heroes Remembrance Day at the Yad Vashem Holocaust Memorial in Jerusalem, Wednesday, April 18, 2012. (AP Photo/Sebastian Scheiner) (credit:AP)