Document Classes ⇒ ntheroem package

[Mikerada6]

Below is the preamble for my already typed 30 page document. What would i have to change in order to start using the ntheorem package. I am using TEXnicCenter. Thank you all for your help.

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% LaTeX Book Template - using defaults
\documentclass[openany]{book}
\usepackage{latexsym}
\usepackage{enumerate}
\usepackage{amsmath, amsthm, amssymb}
\usepackage{graphics}
\usepackage{makeidx}
\newtheorem{ex}{$^{\text{ex}}$}
\newtheorem{note}{$^{\text{note}}$}
\newtheorem{thm}{Theorem}
\newtheorem{lem}{Lemma}
\newtheorem{col}{Corollary}
\newtheorem{defn}{Definition}[chapter]
\renewcommand{\contentsname}{Table of Contents}
\makeindex
% Set the beginning of a LaTeX document
\begin{document}

[Juanjo]

What would i have to change in order to start using the ntheorem package.

Just replace

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\usepackage{amsmath, amsthm, amssymb}

by

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\usepackage{amsmath,amssymb}
\usepackage[amsmath,amsthm]{ntheorem}

Read carefully the documentation of ntheorem
Whether or not you finally move to ntheorem, I would recommend to change several things. The ex and note environments can be defined by

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\newtheorem{ex}{\textsuperscript{ex}}
\newtheorem{note}{\textsuperscript{note}}

Likewise, the numbering of definitions depends on chapters; however, this is not the case for theorems and like. Is this really consistent? Finally, you may consider to set different layouts to different kinds of theorem-like environments. This is done with the \theoremstyle command. With your actual settings, add, for example, \theoremstyle{remark} before the def. of ex, \theoremstyle{plain} before that of thm and \theoremstyle{definition} before that of defn. Compile and compare.