To be completely certain, you should:
* Consult your owner's manual: This will have diagrams showing the location of all major components.
* Use a repair manual or online diagrams: Sites like AutoZone or Haynes provide diagrams specific to your year and model. Searching for "2000 Ford Focus power steering pump diagram" will yield good results.
Without being able to see your specific engine, it's impossible to give a more precise location. But the above information should help you locate it.