convert tabs to spaces controller.php
check if file id is empty alt text print

Check to see if picture file is empty. if not get the relative path.
set alternate text in interchange. grab either the file description,
file title or custom text and pass that to $alternateText variable

only show interchange items that exist
alt text and empty check

check for empty file id. if not empty get relative path. check for
alternate text choice and pass that to alternateText variable.  Only
print to page items that exist