window.addEvent('domready', function() {
  $$('.subscriber_email').each(
    function(se) {
      se.addEvent('focus', function(e) {
        if (se.value == 'Enter email here') se.value = '';
      });
      se.addEvent('blur', function(e){
        if (se.value == '') se.value = 'Enter email here';
      });
    }
  )
});