ROCKVILLE CENTRE - At a time when the national unemployment rate is at 8.1 percent, more than 20 percent of young people on Long Island don't have jobs.So, it's no surprise that local legislators are behind a state-funded program that aims to get at-risk youths back to work, while also giving the businesses who hire them $4,000 worth of tax credits each.Gov. Andrew Cuomo signed off on the $25 million New York Youth Works Program in January. Since then, more than 60 Long Island businesses and 55 young Long Islanders have committed to the program.