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<divid="box"><ul><liid="li01"><imgsrc="./images/01.jpg"alt=""></li><liid="li02"><imgsrc="./images/02.jpg"alt=""></li><liid="li03"><imgsrc="./images/03.jpg"alt=""></li><liid="li04"><imgsrc="./images/04.jpg"alt=""></li><liid="li05"><imgsrc="./images/05.jpg"alt=""></li></ul></div>

css:

<style>
    *{margin:0; padding:0;}ul{list-style: none;}#box{
        width:360px;
        height:70px;
        border:1px solid #ccc;
        padding-top:360px;
        margin:100px auto;
        overflow: hidden;
        background:url(./images/01big.jpg) no-repeat;
    }#boxul{
        overflow: hidden;  /*清除ul里的li标签浮动*/border-top:1px solid #ccc;
    }#boxli{            
        float: left;
    }</style>

js:

<script>
    window.onload = function(){functionfn(liid,bg){var box = document.getElementById("box");
            var obj = document.getElementById(liid);
            obj.onmouseover = function(){
                box.style.backgroundImage = bg;
            }
        }
        fn("li01","url(./images/01big.jpg)");
        fn("li02","url(./images/02big.jpg)");
        fn("li03","url(./images/03big.jpg)");
        fn("li04","url(./images/04big.jpg)");
        fn("li05","url(./images/05big.jpg)");           
    }
</script>

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