Behaviour.register({
  '#Form_NewsletterForm input[type=text]' : {
    onfocus: function() {
      def_val = 'Your Name';
      if (this.name == 'Email') {
        def_val = 'Your Email';
      }
      if (this.value == def_val) {
        this.value = '';
      }
    },
    onblur: function() {
      def_val = 'Your Name';
      if (this.name == 'Email') {
        def_val = 'Your Email';
      }
      if (this.value == '') {
        this.value = def_val;
      }
    }
  }
});