code: function() {
          var tvanim = this;
          var dur = 0.4;
          var a = new YAHOO.util.Anim(this.el, {opacity: {from: 1, to: 0.1, unit:""}}, dur);
          a.onComplete.subscribe( function() { tvanim.onComplete(); } );
          a.animate();
      }
docs: Performs the animation
  @method animate