A Shreveport man's been arrested by Caddo Parish sheriff's detectives for allegedly using a company credit card to swindle his employer out of $18,000.  31-year-old Jeremy Byles was an operations manager at Brown Brother LA, where he had access to company accounts and debit cards.  Detectives say he used the cards to make 17 automated teller machine withdrawals totalling $8,800.  They say he also used a company debit card to deposit more than $9,000 into his personal bank account using a mobile card reader on his cell phone.  He's been booked into Caddo Correctional Center on two counts of unauthorized use of an access card.