From http://phpjs.org/functions/ucwords/

ucwords.js

function ucwords (str) {   
  // http://kevin.vanzonneveld.net   
  // +   original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)   
  // +   improved by: Waldo Malqui Silva   
  // +   bugfixed by: Onno Marsman   
  // +   improved by: Robin   
  // +      input by: James (http://www.james-bell.co.uk/)   
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)   
  // *     example 1: ucwords('kevin van  zonneveld');   
  // *     returns 1: 'Kevin Van  Zonneveld'   
  // *     example 2: ucwords('HELLO WORLD');   
  // *     returns 2: 'HELLO WORLD'   
  return (str + '').replace(/^([a-z\u00E0-\u00FC])|\s+([a-z\u00E0-\u00FC])/g, function ($1) {     
    return $1.toUpperCase();  
  }); 
}