透过js与css控制某一块div能随着窗口而移动

通过js与css控制某一块div能随着窗口而移动

?红色标注的领域需要随着窗口的移动而移动，如何控制呢？
需要需要设定该区域的css属性：

该div需要有一个唯一id：?layout-lt

.guding{background:url(../images/knj_img/knj_19.jpg) repeat-x; height:80px;zoom:1; clear:both;position:fixed;_position:absolute;margin-left:196px;}

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然后需要js来控制：

<script>(function(){var win_h=document.documentElement.clientHeight;document.getElementById('layout-lt').style.top=win_h-80+'px';   //46为底部抓潜的高度；窗口的高度-底部抓潜的高度var ua = navigator.userAgent.toLowerCase(),  //IE6浏览器上下流动缓冲IE = !-[1,],isIE = /ie/.test( ua ),isIE6 = isIE && /msie 6/.test( ua );function addEvent(obj, eventName,func){    if (obj.addEventListener) {        obj.addEventListener(eventName,func, false);    } else if (obj.attachEvent) {        obj.attachEvent("on" + eventName,func);    }}var fun = function(){var oDiv_lt = document.getElementById('layout-lt');setLayout(oDiv_lt);}if(isIE6){addEvent(window,'scroll',fun);//触发滚动事件，调用fun方法window.onload = fun;}function setLayout(obj){if(!obj) return false; var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;var iTaget = parseInt(scrollTop+document.documentElement.clientHeight-obj.offsetHeight);startMove(obj,iTaget);}function startMove(objEle,iTaget){clearInterval(objEle.timeId);objEle.timeId = setInterval(function(){var iSpeed = (iTaget-objEle.offsetTop)/8;iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);if(objEle.offsetTop == iTaget){clearInterval(objEle.timeId);}else{objEle.style.top=objEle.offsetTop+iSpeed+'px';}},30)}})()<!--底部抓潜JS控制--end--></script>

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这样就可以啦！

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ps:

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