/* Glider */ 
Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
	initialize: function(wrapper, panes_wrapper, panes, options){
		this.scrolling  = false;
		this.wrapper    = $(wrapper);
		this.scroller   = this.wrapper.down(panes_wrapper);
		this.sections   = this.wrapper.getElementsBySelector(panes);
		this.length 	= this.sections.length;
		this.scrolling_element = wrapper;
		
		this.options    = Object.extend({ duration: 1.0, frequency: 5, howmanypanes: 1, autoGlide:true }, options || {});
		
		this.sections.each( function(section, index) { section._index = index; });
		
		// initialSection should be the id of the section you want to show up on load
		if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration });
		if(this.options.autoGlide) this.start();
	},
	moveTo: function(element, container, options){
		this.current = $(element);
		Position.prepare();
		var containerOffset = Position.cumulativeOffset(container),
		elementOffset = Position.cumulativeOffset($(element));
		this.scrolling 	= new Effect.SmoothScroll(container, {duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
		toggle_slider_buttons(element.id, this.length);	// added by me
		return false;
	},
	goTo: function(goToID){
		this.moveTo(this.sections[goToID], this.scroller, { duration: this.options.duration });
	},
	next: function(){
		if (this.current) {
			var currentIndex = this.current._index;
			var nextIndex = (this.sections.length - this.options.howmanypanes == currentIndex) ? 0 : currentIndex + this.options.howmanypanes;      
		}
		else 
			var nextIndex = this.options.howmanypanes;	
		this.moveTo(this.sections[nextIndex], this.scroller, { duration: this.options.duration });
	},
	previous: function(){
		if (this.current) {
			var currentIndex = this.current._index;
			var prevIndex = (currentIndex == 0) ? this.sections.length - this.options.howmanypanes : currentIndex - this.options.howmanypanes;
		}
		else 
			var prevIndex = this.sections.length - this.options.howmanypanes;
		
		this.moveTo(this.sections[prevIndex], this.scroller, { duration: this.options.duration });
	},
	stop: function() {
		clearTimeout(this.timer);
	},
	start: function() {
		this.periodicallyUpdate();
	},
	periodicallyUpdate: function() { 
		if (this.timer != null) {
			clearTimeout(this.timer);
			this.next();
		}
		this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
	}
});

Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
	initialize: function(element) {
		this.element = $(element);
		var options = Object.extend({ x: 0, y:0, mode: 'absolute' }, arguments[1] || {});
		this.start(options);
	},
	setup: function() {
		if (this.options.continuous && !this.element._ext ) {
		  this.element.cleanWhitespace();
		  this.element._ext=true;
		  this.element.appendChild(this.element.firstChild);
		} 
		this.originalLeft=this.element.scrollLeft;
		this.originalTop=this.element.scrollTop;
	   
		if(this.options.mode == 'absolute') {
		  this.options.x -= this.originalLeft;
		  this.options.y -= this.originalTop;
		}
	},
	update: function(position) {   
		this.element.scrollLeft = this.options.x * position + this.originalLeft;
		this.element.scrollTop  = this.options.y * position + this.originalTop;
	}
});