Police have arrested a 36-year-old man in connection with a stabbing.  They believe the suspect got into an argument with two homeless men whom he said were making too much noise on the steps of the Kapahulu library.  Paramedics arrived at the scene at 433 Kapahulu Avenue at 12:30 this morning and transported a 50-year-old man in serious condition, and a 53-year-old man in stable condition to a trauma center.  Both men had been attacked with a knife.