function ChangeMenu(menu)
  {
   introdiv.className = 'hide';
   newsdiv.className = 'hide';
   weatherdiv.className = 'hide';
   searchdiv.className = 'hide';

   introtd.className = 'darkgraytd';
   newstd.className = 'darkgraytd';
   searchtd.className = 'darkgraytd';
   weathertd.className = 'darkgraytd';

   if ( menu == "intro" )
      {
       introdiv.className = 'show';
       introtd.className = 'graytd';
      }
   else if ( menu == "news" )
      {
       newsdiv.className = 'show';
       newstd.className = 'graytd';
      }
    else if ( menu == "weather" )
      {
       weatherdiv.className = 'show';
       weathertd.className = 'graytd';
      }
    else if ( menu == "search" )
      {
       searchdiv.className = 'show';
       searchtd.className = 'graytd';
      }
  }