Handling keyboard events is a real nightmare. If you want connect some keyboard events, this page can be usefull : http://unixpapa.com/js/key.html.
Moreover, you need to know Internet Explorer and firefox do no handle event on the same way:
firefox 
myDomNode.onkeypress = function(event) { alert(event.keyCode)}

ie 
myDomNode.onkeypress = function() { alert(window.event.keyCode)}
Actually IE propage key event on window.



So to deal with that mess you need to do 
myDomNode.onkeypress = function(event) {if (!event){event = window.event;} alert(event.keyCode);}