var SlidingTabs = new Class({

  options: {

    startingSlide: false, 

    activeButtonClass: 'active', 

    activationEvent: 'click', 

    wrap: true, 

    	slideEffect: { 
		duration: 400 // 0.4 of a second
		},

    animateHeight: true, 

    rightOversized: 0 

  },

  current: null, 

  buttons: false,

  outerSlidesBox: null,

  innerSlidesBox: null,

  panes: null,

  fx: null, 

  heightFx: null,

  

  

  initialize: function(buttonContainer, slideContainer, options) {

    if (buttonContainer) { this.buttons = $(buttonContainer).getChildren(); }

    this.outerSlidesBox = $(slideContainer);

    this.innerSlidesBox = this.outerSlidesBox.getFirst();

    this.panes = this.innerSlidesBox.getChildren();

    

    this.setOptions(options);

    

    this.fx = new Fx.Scroll(this.outerSlidesBox, this.options.slideEffect);

    this.heightFx = this.outerSlidesBox.effect('height', this.options.slideEffect);

    

    // set up button highlight

    this.current = this.options.startingSlide ? this.panes.indexOf($(this.options.startingSlide)) :0;

    if (this.buttons) { this.buttons[this.current].addClass(this.options.activeButtonClass); }

    

    // add needed stylings

    this.outerSlidesBox.setStyle('overflow', 'hidden');

    this.panes.each(function(pane, index) {

      pane.setStyles({

       'float': 'left',

       'overflow': 'hidden'

      });

    }.bind(this));

    



    this.innerSlidesBox.setStyle('float', 'left');

    

    if (this.options.startingSlide) this.fx.toElement(this.options.startingSlide);

    

    // add events to the buttons

   if (this.buttons) this.buttons.each( function(button) {

      button.addEvent(this.options.activationEvent, this.buttonEventHandler.bindWithEvent(this, button));

    }.bind(this));

    

    if (this.options.animateHeight)

      this.heightFx.set(this.panes[this.current].offsetHeight);

    

    



    this.recalcWidths();

  },

  



  changeTo: function(element, animate) {

    if ($type(element) == 'number') element = this.panes[element - 1];

    if (!$defined(animate)) animate = true;

    var event = { cancel: false, target: $(element), animateChange: animate };

    this.fireEvent('change', event);

    if (event.cancel == true) { return; };

    

    if (this.buttons) { this.buttons[this.current].removeClass(this.options.activeButtonClass); };

    this.current = this.panes.indexOf($(event.target));

    if (this.buttons) { this.buttons[this.current].addClass(this.options.activeButtonClass); };

    

    this.fx.stop();

    if (event.animateChange) {

      this.fx.toElement(event.target);

    } else {

      this.outerSlidesBox.scrollTo(this.current * this.outerSlidesBox.offsetWidth.toInt(), 0);

    }

    

    if (this.options.animateHeight)

      this.heightFx.start(this.panes[this.current].offsetHeight);

  },

  



 buttonEventHandler: function(event, button) {
	
    if (event.target == this.buttons[this.current]) return;

  this.changeTo(this.panes[this.buttons.indexOf($(button))]);
/*alert(button.innerHTML);
 next = this.buttons.indexOf($(button));*/
autoslidingtabs = new AutoSlidingTabs('buttons', 'panes', {autoSlideDelay: 20});
  }, 

  



  next: function() {

    var next = this.current + 1;
    if (next == this.panes.length) {

      if (this.options.wrap == true) { next = 0 } else { return }

    }

    

    this.changeTo(this.panes[next]);

  },

  



  previous: function() {

    var prev = this.current - 1

    if (prev < 0) {

      if (this.options.wrap == true) { prev = this.panes.length - 1 } else { return }

    }

    

    this.changeTo(this.panes[prev]);

  },

  

  // call this if the width of the sliding tabs container changes to get everything in line again

  recalcWidths: function() {

    this.panes.each(function(pane, index) {

      pane.setStyle('width', this.outerSlidesBox.offsetWidth.toInt() - this.options.rightOversized + 'px');

    }.bind(this));

    

    this.innerSlidesBox.setStyle(

      'width', (this.outerSlidesBox.offsetWidth.toInt() * this.panes.length) + 'px'

    );

    

    // fix positioning

    if (this.current > 0) {

      this.fx.stop();

      this.outerSlidesBox.scrollTo(this.current * this.outerSlidesBox.offsetWidth.toInt(), 0);

    }

  }

});



SlidingTabs.implement(new Options, new Events);

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