Edit in JSFiddle

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>图片减速度滚动(by rentj1@163.com;)</title>
<style>
ul{ margin:0; padding:0}
ul{ list-style:none;}
body{font:12px/1.2 "宋体"; }

.scroll_box{ position:relative; height:164px; width:766px; border:1px solid #efefef; overflow:hidden;}
.scroll_box .list{ overflow:hidden; zoom:1; position:absolute;}
.scroll_box .list li{ width:235px; height:164px; padding:0 10px;  text-align:center; float:left;}
.scroll_box .list .info{ line-height:1.5}

</style>
</head>

<body>

<div class="scroll_box" id="container">
    <ul class="list" id="content">
        <li>
            <img src="http://img14.360buyimg.com/n4/4587/cd8a8a76-24f4-44d8-876b-12d78cbae588.jpg" /> 
                <div class="info">
                兵尼兔 环保大包围专车专用脚垫 米色（专车专用，仅支持在线支付）版型精准 大包围
                </div>
                <span class="price">会员价：￥288.00</span>
        </li>
        
        <li>
            <img src="http://img11.360buyimg.com/n4/309/9230eaef-021c-447d-a64b-51ce698822ef.jpg" />  
                <div class="info">
                兵尼兔 环保大包围专车专用脚垫 米色（专车专用，仅支持在线支付）版型精准 大包围
                </div>
                <span class="price">会员价：￥288.00</span>
        </li>
        
        <li>
            <img src="http://img10.360buyimg.com/n4/8792/7691b514-a0b3-469e-8a2b-37b219ebc490.jpg" /> 
                <div class="info">
                兵尼兔 环保大包围专车专用脚垫 米色（专车专用，仅支持在线支付）版型精准 大包围
                </div>
                <span class="price">会员价：￥288.00</span>
        </li>
        
        <li>
            <img src="http://img12.360buyimg.com/n4/285/c675cbb0-3a6f-4703-95fb-e75a7c90b48e.jpg" /> 
                <div class="info">
                兵尼兔 环保大包围专车专用脚垫 米色（专车专用，仅支持在线支付）版型精准 大包围
                </div>
                <span class="price">会员价：￥288.00</span>
        </li>
        
        <li>
            <img src="http://img12.360buyimg.com/n4/1957/22aa7c6d-4b70-49b8-a985-678b1d0e3781.jpg" /> 
                <div class="info">
                兵尼兔 环保大包围专车专用脚垫 米色（专车专用，仅支持在线支付）版型精准 大包围
                </div>
                <span class="price">会员价：￥288.00</span>
        </li>
        
        <li>
            <img src="http://img10.360buyimg.com/n4/2314/cf09b35a-eb6d-4a4f-a4dd-3301bfafef99.jpg" /> 
                <div class="info">
                兵尼兔 环保大包围专车专用脚垫 米色（专车专用，仅支持在线支付）版型精准 大包围
                </div>
                <span class="price">会员价：￥288.00</span>
        </li>
    </ul>
</div>

<script>
untils = {
    
     getComputedStyle: function(elem,syle){
            var computedStyle = document.defaultView 
                && document.defaultView.getComputedStyle
                && document.defaultView.getComputedStyle(elem,null);
                
             if(!computedStyle){
                computedStyle = elem.currentStyle
            }
            return computedStyle[syle]
     },
    
    setStyle: function(elem, name,val){
        elem.style[name] = val;
    },
    
    get: function(id){
        document.getElementById(id)
    }
}

function ScrollSlider(container, content){
    var clone = content.cloneNode(true);
    var initcss=  "left:0; top:0";
    var contentHeight = content.offsetHeight;
    var containerHeight = container.clientHeight;
    clone.id = "content-clone";
    container.appendChild(clone);
    clone.setAttribute("cssText", initcss);
    content.setAttribute("cssText", initcss);
    clone.style.marginTop = contentHeight+"px";

    
    this.content = content;
    this.clone = clone;
    this.container = container;
    this.containerHeight = containerHeight;
    this.contentHeight = contentHeight;
}

ScrollSlider.prototype = {
    
    start: function(delay){        
        var _this = this;
        clearInterval(_this.timer);
        _this.timer = setInterval(function(){
            _this.scroll();                    
        },delay);
    },
    
    scroll: function(){
        
        var marginTop = parseInt(untils.getComputedStyle(this.content, "marginTop"));
        var offsetTop = this.contentHeight;
        if(isNaN(marginTop))return;
        
        if( -marginTop >= this.contentHeight){
            marginTop = this.contentHeight;
            
        }
        
        if(marginTop > 0){
            offsetTop = -offsetTop;
        }
        
        this.move(marginTop, offsetTop);

    },
    
    move: function(marginTop, offsetTop){
        var s = this.containerHeight, s1 = 0, _this = this, m = 0;
        var timer = setInterval(function(){
            var speed = (s-s1)/8;
            speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
            s1 += speed;
            m = marginTop - s1;
            
            untils.setStyle(_this.content, "marginTop", m + "px");
            untils.setStyle(_this.clone, "marginTop", (m + offsetTop)+"px");
            if(s-s1 <= 0){
                clearInterval(timer);
            }
            
        },30);
        

    }
};

var container = document.getElementById("container")
var content = document.getElementById("content")
var xx = new ScrollSlider(container, content);
xx.start(1000*3);
/*
//s=1/2 * at^2

//s (att)/2
//0<s<164
0,-164,-328,164,0
328,164,0,-164,-328,164,0
*/
</script>
</body>
</html>