gistfile1.js

YUI.add('gallery-slider-captcha', function(Y){
  
  Y.SliderCaptcha = Y.Base.create('slider-captcha', Y.Widget, [], {
    
    //  P U B L I C  //
    initializer : function() {
      // publish release-success event
      // publish release-failure event
    },
    
    renderUI : function() {
      // build message container
      
      // build handle
      
      // append to content box 
    },
    
    bindUI : function() {
      // add dd to handle and constrain to content box
      
      // add opacity change to text while dragging based on percentage to end. 100% - 10%?
      
      // add animation to spring back on release if not at the edge of the container
      
      // add release callback to fire success or failure event
    },
    
    //  S U G A R  //
    isHuman : function() {
      return this.get('isHuman');
    },
    
    //  P R O T E C T E D  //
    _defSuccessReleaseFn : function(e) {
      // update text
      // set isHuman to true
    },
    
    _defFailureReleaseFn : function(e) {
      // set isHuman to false
    }
  }, {
    ATTRS : {
      form : {},
      startText : {},
      successText : {},
      isHuman : {
        value : false
      },
      submitOnSuccess : {
        value : true // should it default to submit?
      }
    }
  });
  
}, '0.1', {'widget','dd-constrain'});

Only had about 30 minutes to work on this... will do more tonight, if you havn't already started... You can find my fork here: http://gist.github.com/519956