[NTG-context] Working with conditionals

3 Jan 2011

      I have the folowing function for a title:
\def\Title[#1]{
  \testpage[10]
  \startalignment[center]
  {
      \blank[2*big]
      \switchtobodyfont[1.5em]
      \bf\em#1
  }
  \blank
  \stopalignment
}

What I would like is that there is an optional second parameter. When
it is there, it is used in the testpage command. Otherwise the default
value is used. How would I do this?

-- 
Cecil Westerhof