[jQuery] how can I register an event handler as the first one to be executed for that event?

[MarcS]

Hi,

I'm looking for a way to register an event handler for the submit
event of a form as the first one to be executed.
nyroModal, a lightbox like plugin I'm using registered its event
handler on this form already but I need my custom one to be executed
before the one from nyromodal.
Is there anyway I can do that?