Cash from pocket as a raise?

[RyanTaylor]

This is a question of whether or not cash can be played from the pocket in a game where chips have to be purchased. The situation from which the question arose is this:

5 person game, $1/2 blinds, no limit

I hold [img]/images/graemlins/spade.gif[/img]4 [img]/images/graemlins/diamond.gif[/img]10 in BB
Next two people fold
Button (loose, position player) calls with rags
SB (very loose agressive) limps with [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/heart.gif[/img]K

flop is [img]/images/graemlins/diamond.gif[/img]4 [img]/images/graemlins/heart.gif[/img]4 [img]/images/graemlins/club.gif[/img]4

SB raises $3
I call
Button folds

Turn is inconsequential

SB bets $5
I call to give the illusion of holding Ace high (a hand ive become popular for winning with)

River helps no one

BB puts me all in (about $15)
I call, but stand up and raise $65 cash from my wallet.
BB puts me on a bluff and calls
I show my 4 of a kind, he is completely broke.

So, once again, can I use cash in a chip game? Was I allowed to raise from my wallet and was the BB required to protect the his chips with outside cash? The agreement in our game is that he could have told me no outside cash, but was allowed to call my cash bet at his discretion. Any opinions?