Use the "listings" package instead. This gives the option of breaking long lines with an adjustable indent. "breaklines=true" sets the line break, and you can set specific symbols to put before and after breaks to indicate them using "prebreak" and "postbreak". This example comes out of "The LaTeX Companion, 2nd Ed." (Mittelbach and Goossens), page 173:
Code:
\usepackage{color,listings}
\lset{breaklines=true,breakindent=0pt,
prebreak=\mbox{\tiny$\searrow$},
postbreak=\mbox{{\color{blue}\tiny$\rightarrow$}}}
\begin{lstlisting}
SOURCE CODE GOES HERE
\end{lstlistings}
This package is also interesting because you can define what language you are coding in and it will do selective bolding, etc. In classic LaTeX style, it's a VERY customizable package.
Oh, and I highly recommend that book I quoted. It's rather comprehensive. "A Guide To LaTeX" by Kopka and Daly is not bad either, but much more basic.