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• onkeyup and onkeydown Key Codes

Key Pressed	Firefox	Safari	Chrome	Opera	IE
Backspace	8	8	8	8	8
Tab	9	9	9	9	9
Enter	13	13	13	13	13
Shift	16	16	16	16	16
Ctrl	17	17	17	17	17
Alt	18	18	18	18	18
Pause, break	1	1	1	1	1
Caps Lock	20	20	20	20	20
Esc	27	27	27	27	27
Space	32	32	32	32	32
PageUp	33	33	33	33	33
Page Down	34	34	34	34	34
End	35	35	35	35	35
Home	36	36	36	36	36
Left Arrow	37	37	37	37	37
Up Arrow	38	38	38	38	38
Right Arrow	39	39	39	39	39
Down Arrow	40	40	40	40	40
Insert	45	45	45	45	45

• http://www.javascripter.net/faq/keycodes.htm

• Some onkeyup and onkeydown Key Codes