[jQuery] A beginerhaving problems with jquery

[BrownPrince]

I just started using jquery recently. I do understand the codes and
how they work but i cant understand how to reference external jquery
file in the head section. If you download jquery libraries you see
e.g: jquery.1.2.3.js, but in the tutorials they expect you to refeer
to a certain jquery.js file. Please could someone help me solve this
problem? You could also mail me with t.una...@yahoo.co.uk