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  • Thanks! It fixed all my errors. Just a few questions: (1) why do you make use of \gdef? (2) can I make use of \newcommand instead of \def? Is it just a personal choice or is there a reason why you used it? Commented Jul 25, 2013 at 7:37
  • @PradeepKumar: \gdef is \global\def. It overrides the \def. I personally used \def rather than \newcommand, which is more convenient for me. The main logic is, define a default value for logo inside \@logo and if you have your own logo provided by \logo command in TeX, make it a global value to \@logo and override the default value. Commented Jul 25, 2013 at 7:45