arrow keys with SWFBUTTON_KEYPRESS ?

I'm writing a chat app and I wanted to have some history for what the user 
has typed and tie that to the arrow keys, but ugh... I've looked at all 
sorts of ASCII charts and I can't seem to figure out the correct 
character(s) to place into SWFBUTTON_KEYPRESS to trap the arrow keys for this.

For instance, trapping any printable key is obviously dead easy, and things 
like the Enter key shows up in ASCII charts so SWFBUTTON_KEYPRESS(chr(13)) 
works there (or alternatively SWFBUTTON_KEYPRESS("\n")). I've even found 
some octal escape sequences (SWFBUTTON_KEYPRESS("\x3E")) works for <).

Anyway, long post for a really simple thing: does anyone know the usuable 
escape sequences representing arrow keys?
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[email protected] (Rogdor)