Should I call all in here? HU

[Schizo]

Party Poker No-Limit Hold'em Tourney, Big Blind is t400 (2 handed) converter

Button (t3317)
Hero (t4683)

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img].
Button calls [t3317] , Hero ......

My buddy and I are in an argument. I don't know about this situation but my buddy is 100% sure. What do you guys think?

What other information do you need? Stats?