Seeing through the radio

STERLING - Jim Henry's eyes never leave the script as he fidgets with the carefully chosen knickknacks on the table before him. It's not because he's engrossed in his reading and trying to balance his hobbies. He's the foley artist - the guy in charge of sound creation - for the Centennial Community Players' "radio play" performance of "It's a Wonderful Life," which opens Friday at Woodlawn Arts Academy. While the six actors reinvent their voices to match the show's 15 characters, Henry is busy darting between ends of a card table, carefully crafting Frank Capra's Christmas world with a menagerie of sounds: He topples buckets (trips over trash cans), tosses Tic-Tacs (measures prescription pills), slams shut a refrigerator (closes a car door