Detecting outside clicks of an element using JavaScript

functions.js

/* Verify clicks outside .target-element */
$('.target-element').outside('click', function() {
  // do something
}                     

/* Function that detect outside clicks */
(function($){
  $.fn.outside = function(ename, cb){
      return this.each(function(){
          var self = this;

          $(document).bind(ename, function tempo(e){
              if(e.target !== self && !$.contains(self, e.target)){
                  cb.apply(self, [e]);
                  if(!self.parentNode) $(document.body).unbind(ename, tempo);
              }
          });
      });
  };
}(jQuery));