Textbox Action

[sizimon]

Hi,

I am writing a toolbar extension for Firefox, and I am trying to add a searchbox.  This is a textbox element, which I understand how to add and use the text from when a button is clicked, but I was wondering how I can have the searchbox trigger a javascript function when the user presses the enter key after inputting text.

I have searched around for the web for this, but have not had any luck.  Any help would be appreciated.  Thanks!