Free online programme for making crossword puzzles

For all my EAL classes - if I set you a homework to make a vocabulary crossword puzzle, this is the programme to make it with:

http://puzzlemaker.discoveryeducation.com/CrissCrossSetupForm.asp

It's dead easy to use but I'll post a video here later to show you exactly how to do it.

Here's the video I promised:

How to make a crossword puzzle using this software