function slider(options){
this.left=$(options.left);
this.right=$(options.right);
this.all=$(options.all);
this.items=$(options.item);
this.itemWidth=this.items.width()+parseInt(this.items.css('margin-left'));
this.width=this.itemWidth*this.items.length;
this.all.width(this.width);
var $this=this;
this.clicked=false;
this.right.click(function(){
	if( ($this.all.position().left!=((-$this.itemWidth*$this.items.length)+4*$this.itemWidth))&&($this.clicked==false)&&($this.clicked==false)&&($this.items.length>4))
		{$this.all.animate({left:'-='+($this.itemWidth+10)}).animate({left:'+=10'},
				function(){
					$this.clicked=false;
					$this.auto=setInterval($this.interval, 4000);		
							});
	 $this.clicked=true;
	 clearInterval($this.auto);
	 }

	});

this.left.click(function(){
	if(($this.all.position().left!=0)&&($this.clicked==false))
		{$this.all.animate({left:'+='+($this.itemWidth+10)}).animate({left:'-=10'},
			function(){
				$this.clicked=false;
				$this.auto=setInterval($this.interval, 4000);	
					});
		$this.clicked=true;
		clearInterval($this.auto);
		}

	});
this.separCount=Math.ceil(this.items.length/4);
this.x=0;
this.dir='right';
this.interval=function(){
	if($this.x==$this.separCount) $this.dir='left';
	if($this.x==0) $this.dir='right';
		if( $this.dir=='right') {
		$this.right.trigger('click');
		$this.x++;

		}
		if($this.dir=='left')
		{		
		$this.x--;
		$this.left.trigger('click');
		}

}
this.auto=setInterval(this.interval, 4000);
}

a=new slider({left:'#prev', right: '#next', all: '#offAll', item: '.off'});