Help: Diecimila and SHT15 Pull-up Resistor?

Dear all,

I'm learning about Arduino Diecimila step by step, and enjoying it very much. I'm trying to connect a Humidity and Temp. measurement breakout board, SHT15. I've checked with the Forum article regarding Arduino BT and SHT11, similar set-up.

I found, recently, that I need pull-up resistors for the data acquisition. Would the hardware resistors may be replaced by the built-in function of Arduino, Digitalwrite function? Thanks,

Bryan :) :) ;)