upperBB using high or low instead of close

[eminitrader]

I'm trying to setup a Bollinger Band study using the high and low instead of the close ( which is default )

I've tried using upperBB( 20, 2, high ) but that doesn't work.
Do i need to generate an array of high and then pass that to the upperBB function?

Thanks

[ACM]

eminitrader
The syntax is upperBB(20,2,high())
Alex