var slider = new Class({
	initialize: function(params){
		this.items = params.items;
		this.mode = params.mode || 'horizontal';
		this.modes = {horizontal:['left','width'], vertical:['top','height']};
		this.size = params.size || 240;
		this.box = params.box.setStyle(this.modes[this.mode][1],(this.size*this.items.length)+'px');
		this.button_event = params.button_event || 'click';
		this.handle_event = params.handle_event || 'click';
		this.onWalk = params.onWalk || null;
		this.currentIndex = null;
		this.previousIndex = null;
		this.nextIndex = null;
		this.interval = params.interval || 5000;
		this.autoPlay = params.autoPlay || false;
		this._play = null;
		this.handles = params.handles || null;
		if(this.handles){
			this.addHandleButtons(this.handles);
		}
		this.buttons = {
			previous: [],
			next: [],
			play: [],
			playback: [],
			stop: []
		};
		if(params.addButtons){
			for(var action in params.addButtons){
				this.addActionButtons(action, $type(params.addButtons[action])=='array' ? params.addButtons[action] : [params.addButtons[action]]);
			}
		}
		this.fx = new Fx.Tween(this.box,$extend((params.fxOptions||{duration:500,wait:false}),{property:this.modes[this.mode][0]}));
		this.walk((params.startItem||0),true,true);
	},

	addHandleButtons: function(handles){
		for(var i=0;i<handles.length;i++){
			handles[i].addEvent(this.handle_event,this.walk.bind(this,[i,true]));
		}
	},

	addActionButtons: function(action,buttons){
		for(var i=0; i<buttons.length; i++){
				switch(action){
				case 'previous': buttons[i].addEvent(this.button_event,this.previous.bind(this,[true])); break;
				case 'next': buttons[i].addEvent(this.button_event,this.next.bind(this,[true])); break;
				case 'play': buttons[i].addEvent(this.button_event,this.play.bind(this,[this.interval,'next',false])); break;
				case 'playback': buttons[i].addEvent(this.button_event,this.play.bind(this,[this.interval,'previous',false])); break;
				case 'stop': buttons[i].addEvent(this.button_event,this.stop.bind(this)); break;
			}
			this.buttons[action].push(buttons[i]);
		}
	},

	previous: function(manual){
		if(this.currentIndex <= 2){
			get_element("trigger_previous").style.display = "none";
		}
		
		/*hide non-current flv/image*/
		for( x=0; x<document.frm1.elements.length; x++ )
		{
			var e = document.frm1.elements[x];
			nm=e.name.split("_");
		
			if(nm[0]=="contenttype" )
			{
					contenttype=e.value;
			}
			
			if(nm[0]=="spanid" && contenttype=="flv")
			{
				id="idspan"+e.value;
				if(this.currentIndex-2!=e.value)
				{
					document.getElementById(id).style.visibility="hidden";
				}
				else
				{
					document.getElementById(id).style.visibility="visible";
				}
			}
		}
		/* end hide non-current flv/image*/
		
		this.walk((this.currentIndex>0 ? this.currentIndex-1 : this.items.length-1),manual);
	},

	next: function(manual){
		
		/*hide non-current flv/image*/
		for( x=0; x<document.frm1.elements.length; x++ )
		{
			var e = document.frm1.elements[x];
			nm=e.name.split("_");
			if(nm[0]=="contenttype" )
			{
					contenttype=e.value;
			}
			
			if(nm[0]=="spanid" && contenttype=="flv")
			{
				id="idspan"+e.value;
				if(this.currentIndex!=e.value)
				{
					document.getElementById(id).style.visibility="hidden";
				}
				else
				{
					document.getElementById(id).style.visibility="visible";
				}
			}
		}
		/* end hide non-current flv/image*/
		
		
		if(this.currentIndex >= 1){
			get_element("trigger_previous").style.display = "block";
		}
		else{
			get_element("trigger_previous").style.display = "none";
			
		}
		
		//check to see if the animation has reached the last item
		if((this.currentIndex+1) == (this.items.length)){
			var initial_animate = new Chain();
				
			var initial_animate1 = function(){
				animation.walk(0,manual);
			};
			
			var initial_animate2 = function(){
				animation.next();
			};
			
			initial_animate.chain(initial_animate1);
			initial_animate.chain(initial_animate2);

			initial_animate.callChain();
			initial_animate.callChain.delay(1250, initial_animate);
			initial_animate.callChain.delay(1, initial_animate);
		}
		else{
			this.walk((this.currentIndex<this.items.length-1 ? this.currentIndex+1 : 0),manual);
		}
	},

	play: function(interval,direction,wait){
	
		this.stop();
		if(!wait){
			this[direction](false);
		}
		this._play = this[direction].periodical(interval,this,[false]);
	},

	stop: function(){
		$clear(this._play);
	},

	walk: function(item,manual,noFx){
		if(item!=this.currentIndex){
			
			this.currentIndex=item;
			this.previousIndex = this.currentIndex + (this.currentIndex>0 ? -1 : this.items.length-1);
			this.nextIndex = this.currentIndex + (this.currentIndex<this.items.length-1 ? 1 : 1-this.items.length);
			if(manual){
				this.stop();
			}
			if(noFx){
				this.fx.cancel().set((this.size*-this.currentIndex)+'px');
			}else{
				this.fx.start(this.size*-this.currentIndex);
			}
			if(manual && this.autoPlay){
				this.play(this.interval,'next',true);
			}
			if(this.onWalk){
				this.onWalk((this.items[this.currentIndex] || null), (this.handles && this.handles[this.currentIndex] ? this.handles[this.currentIndex] : null));
			}
		}
	}
	
});