... Hametz is bread and other leavened products that many Jews do not eat for the eight days of Passover, which starts Saturday night. The Bible says that when God freed the Jews from enslavement in Egypt, they left in such a hurry that there was no time for their bread to rise, and to mark that circumstance, consuming leavened bread during the holiday is forbidden.
The focus of the debate here is a ruling by a Jerusalem municipal judge overturning the convictions of four shops and restaurants for having sold pizzas and rolls during the holiday last year despite a law that many thought prohibited businesses from doing so. The judge said the law barred only the public display of hametz, not its sale inside shops ...
http://www.nytimes.com/2008/04/18/world/middleeast/18israel.html?_r=1&ref=world&oref=slogin