Prevent default at start of handler, so it's actually prevented
Prevent default at start of handler, so it's actually prevented

gootdude/bookreader,openlibrary/bookreader,yankl/bookreader,Islandora/internet_archive_bookreader,gootdude/bookreader,nikolas/bookreader,Islandora/internet_archive_bookreader,Islandora/internet_archive_bookreader,niksu/bookreader,openlibrary/bookreader,internetarchive/bookreader,gootdude/bookreader,yankl/bookreader,Islandora/internet_archive_bookreader,internetarchive/bookreader,brisandbeans/bookreader,garyrh/bookreader,yankl/bookreader,niksu/bookreader,openlibrary/bookreader,garyrh/bookreader,openlibrary/bookreader,openlibrary/bookreader,garyrh/bookreader,brisandbeans/bookreader,yankl/bookreader,brisandbeans/bookreader,yankl/bookreader,garyrh/bookreader,garyrh/bookreader,niksu/bookreader,Islandora/internet_archive_bookreader,nikolas/bookreader,niksu/bookreader,brisandbeans/bookreader,brisandbeans/bookreader,niksu/bookreader,gootdude/bookreader