Network Solutions, one of the leading domain registration service providers, said Tuesday it will reposition its brand and web site to focus on small businesses, the fastest-growing segment on the Internet. It has created a starter package for small businesses and is sprucing up its customer support to offer 24/7 service. Over the next 12 months, 2.5 million small businesses are likely to go online. Small business spending on web hosting is growing by 9.5 percent annually and will top $7.4 billion by 2009, said IDC