Up to 6 keys at once

[spencersheridan]

Hi there. On the main webpage for this script, I can press up to 6 keys on my keyboard and see them light up on your example keyboard. However, when I implement the code on my site, if I am holding down two keys and then press a third on, the "on_keydown" function does not get called. Is there an obvious reason for this? How do you accomplish detecting SIX keypresses at once?