A Claiborne Parish man -- found in the company of a runaway Shreveport teenager -- is now behind bars.  24-year-old Quindaryl Ridley of Homer has been booked into the Shreveport City Jail on one count each of pornography involving juveniles and contributing to the delinquency of juveniles.  He was taken into custody for questioning after patrolmen spotted him with a runaway 13-year-old inside a business in the 200 block of Fort Street.  Investigators think Ridley helped the girl run away.  They say the pornography involving juveniles charge stems from images recovered from his cell phone during the investigation.