using LCD bargraph with SRLCD

I've tested each one of these alone, but don't know how to use both...
I want to use these two things:
http://arduino.cc/playground/Code/LcdBarGraph
http://code.google.com/p/arduinoshiftreglcd/

I tried changing this:

LcdBarGraph lbg(&lcd, DISPLAY_WIDTH);  //LCD Bargraph

to this:

LcdBarGraph lbg(&srlcd, DISPLAY_WIDTH);  //LCD Bargraph

...with no luck.
???

http://arduino.cc/playground/Code/LcdBarGraph
http://code.google.com/p/arduinoshiftreglcd/
To use both of these, would the bargraph.h library have to be editted to make it work with srlcd.h, instead of liquidcrystal.h?
It looks over my head.