We don't (yet) have any barcode readers, so for at least the start of adding our books to Koha our staff will be entering the barcodes manually. This seems likely to lead to typos and incorrect barcodes in the database. The barcodes I'm generating include a check digit, is there some way of getting Koha to verify this when adding an item? I just need a little Javascript function to run when the barcode field loses focus, checking that the barcode is valid. I've looked at plugins but they seem to disable the input field and require the use of a pop-up for value entry, which seems excessively fiddly. I'd also like barcode verification when adding new members, there doesn't seem to be any plugin mechanism for that part of Koha. Kevin -- Kevin O'Rourke ICT Coordinator, National Teachers' Institute, Kaduna, Nigeria 062 316972