Insert GIF in LaTeX

I'd like to insert a GIF image in my text and I found this Convert GIF image to PNG on the fly.

So I pasted in my document

\documentclass[a4paper]{article}\usepackage{graphicx}\DeclareGraphicsRule{.JPG}{eps}{.JPG}{`convert #1 eps:-}\begin{document}\framebox{\includegraphics[0,0][150,200]{DSC00121-SMALL.JPG}}\end{document} 

Namely I have

\usepackage{graphicx}\DeclareGraphicsRule{.JPG}{eps}{.JPG}{`convert #1 eps:-}

and then

 \framebox{\includegraphics[0,0][150,200]{nn.JPG}}

Also I have renamed the picture as nn.JPG

But it doesn't work! Any help?