ScrollCrossLeft={interval:0,count:0,duration:0,step:0,srcObj:null,callback:null};
ScrollCrossLeft.doit=function(obj,b,c,d){
	var s=ScrollCrossLeft;
	obj.style.marginLeft=cpu(s.count,b,c,d)+'px';
	s.count++;
	if(s.count==d){
		clearInterval(s.interval);
		s.count=0;
		obj.style.marginLeft=b+c+'px';
		s.callback();
	}
	function cpu(t,b,c,d) {return c*((t=t/d-1)*t*t+1)+b;};
}
ScrollCrossLeft.scroll=function(obj,step,span,beign,callback,duration){
	var s=ScrollCrossLeft;
	s.duration=duration;
	s.callback=callback;
	s.interval=setInterval(function(){s.doit(obj,beign,step*span,duration)},10);
}

var Turn={}
Turn.pre=function(obj){
	if(obj.current==0){
		return;
	}else{
		Turn.go(obj,obj.current-1);
	}
}
Turn.next=function(obj){
	if(obj.current==2){
		return;
	}else{
		Turn.go(obj,obj.current+1);
	}
}
Turn.go=function(obj,index){
	if(obj.current==index){return;}
	var span=-index+obj.current;
	if(obj.clickflag > 0){return;}
	obj.clickflag=1;
	if(obj.step>0)
		ScrollCrossLeft.scroll($$(obj.div),obj.step,span,parseInt($$(obj.div).style.marginLeft)||0,cb,10);
	else{
		displayNOrY();
		cb();	
	}
	function imgSrc(index,id){
		var arr_img=$$(id+'_'+index).getElementsByTagName('img');
		for(var i=0;i<6;i++){
			arr_img[i].src=obj.imgs[index-1][i];
		}
	}
	function cb(){
		obj.current=index;
		obj.clickflag=0;
		for(var i=0;i<3;i++){
			$$(obj.a+i).className='';
		}
		$$(obj.a+index).className='currA';
	}
	function displayNOrY(){
		obj.current=index;
		for(var i=0;i<3;i++){
			if(i==index)
				$$(obj.ul+'_'+i).style.display='block';
			else
				$$(obj.ul+'_'+i).style.display='none';
		}
	}
}