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Hmm, but the problem is with at least TeXMaker shows undefined symbol on lines with frontmatter. How to solve this?

Thanks for help! Changed my code a little bit with your suggestions but now have different problem. My example tex file which I want to compile now:

% Template article for preprint document class `elsart'
\documentclass[preprint, 12pt]{elsarticle}

\makeatletter
\def\@author#1{\g@addto@macro ...

Im using Texmaker 3.4 on Ubuntu 13.04. I downloaded all files from http://tug.ctan.org/tex-archive/macros/latex/contrib/elsarticle/ and saved into elsarticle directory. Then, I run command:

latex elsarticle.ins

got such files:

elsarticle.cls elsarticle-num-names.bst elsarticle-template-3a-num ...