The Fire and Police Commission voted unanimously Thursday night to approve a provision in Mayor Tom Barrett's proposed 2010 budget that would impose four unpaid furlough days for City of Milwaukee firefighters and police officers.The commission's approval was necessary in order for the furloughs to be legal, city budget and management director Mark Nicolini told the commission at its meeting at the Wilson Park Senior Center.Nicolini said the furloughs were needed to prevent layoffs and help plug a projected $93 million city budget shortfall in 2010.