// Wrap each word in a span.
$('#main-nav a').each(function(){
var text = $(this).text().split(' ');

       for( var i = 0, len = text.length; i < len; i++ ) {
           text[i] = '<span class="word-' + i + '">' + text[i] + '</span>';
       }
       $(this).html(text.join(' '));

  });