Sort events function help.

Hi guys
Just wondering if you can point me in the right direction to modify this function. I use it to sort events by category and it works well. What I was hoping to do is add some code to the function to place one category first always.

The name of the category is Meeting and it has a category id number of 20.

Thanks for the help
Steve

// Sort events by category

function sortjeventsbycat($a,$b){

   if ($a->getCategoryName() == $b->getCategoryName()){

      if ($a->title() == $b->title()) {

         return 0;

      }

      return ($a->title() < $b->title()) ? -1 : 1;

   }

   return $a->getCategoryName() < $b->getCategoryName() ? -1 : 1;

}