LaTeX.org

Sorry, here is an example of the tex file:
\documentclass{article}
\usepackage{url}

%% Define a new 'leo' style for the package that will use a smaller font.
\makeatletter
\def\url@leostyle{%
\@ifundefined{selectfont}{\def\UrlFont{\sf}}{\def\UrlFont{\small\ttfamily}}}
\makeatother
%% Now actually ...

Hi there I hope someone can help, I'm pretty new to LaTeX and am just getting my head around the concepts, but I have to write a paper for it pretty quick :? My problem is with inserting URLs into the .bib file of a sample document I am playing around with. I've spend about 3 hours playing around ...