js实现图片上显示左右箭头类似翻页效果的代码

<script type="text/javascript">
function KeleyiImgNext(bigimg) {
var lefturl = "01.html";
var righturl ="03.html";
var imgurl = righturl;
var width = bigimg.width;
var height = bigimg.height;
bigimg.onmousedown = bigimg.onmousemove = function () {
if (event.offsetX < width / 2) {
imgurl = lefturl;
if (imgurl != "#")
bigimg.style.cursor = 'url(images/arr_left.cur),auto';
else
bigimg.style.cursor = 'default';
} else {
imgurl = righturl;
if (imgurl != '#')
bigimg.style.cursor = 'url(images/arr_right.cur),auto';
else
bigimg.style.cursor = 'default';
}
}
bigimg.onmouseup = function () {
if (imgurl != '#')
top.location = imgurl;
}
}
</script>
<img onmouseover="KeleyiImgNext(this)" src="/img/test001.jpg" alt="左右翻页效果" />