function watchForm( form ) {
      // Watch the form for submission
      addEvent( form, 'submit',  function(){
  
          // make sure that the form's contents validate correctly
          return validateForm( form );
  
      });
  }
  
  // Find the first form on the page
  var form = document.getElementsByTagName( "form" )[0];
  
  // and watch for when its submitted, to validate it
  watchForm( form );