A New Brighton man is going to prison after admitting to child sex charges.  Joseph Kaluza pleaded guilty last week and will spend two-to-12 years behind bars.  Detectives posed as a 14-year-old girl in a chatroom and communicated with Kaluza for several weeks.  He reportedly sent lewd pictures and tried to set up a meeting at a hotel for sexual activity.  Police also found child pornography on Kaluza’s computer.