edrawing Viewer - Navigation

Hi, forgive my ignorance as I'm not familiar with SolidWorksat all but I'm hoping someone may be able help out with a simplequery.
I have been sent a model (.easm file) and have downloaded the free2009 edrawing viewer to view.

My question is when you are rotating the model how do you centrethe rotation around a selected part (or preferable point in spaceof your choosing). It is very frustrating as the centre of rotationis currently a long way away from the parts of interest.

Once again sorry if this is S.Works 101.

Thanks,
Nathan.SolidworksEdrawings