div层开始时是固定不动的,单击按钮后却随滚动条动了是咋回事啊

div层开始时是固定不动的,单击按钮后却随滚动条动了是怎么回事啊?
想让div层开始时就随滚动条滚动

------解决方案--------------------
http://www.51windows.net/data/?url=/data/files/file_614.asp

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<HEAD>

<TITLE>随滚动条移动的层 - 51windows.Net</TITLE>

<META HTTP-EQUIV="Content-Type" CONTENT="text/html" charset="gb2312">

<META NAME="Author" CONTENT="haiwa">

<META NAME="homepage" CONTENT="www.51windows.net">

</HEAD>

<style>

<!--

.div{

	position: absolute;

	border: 2px solid red;

	background-color: #EFEFEF;

	line-height:90px;

	font-size:12px;

	z-index:1000;

}

-->

</style>

<BODY>

<div id="Javascript.Div1" class="div" style="width: 240px; height:90px" align="center">正中...</div>

<SCRIPT LANGUAGE="JavaScript">

function sc1(){

	document.getElementById("Javascript.Div1").style.top=(document.documentElement.scrollTop+(document.documentElement.clientHeight-document.getElementById("Javascript.Div1").offsetHeight)/2)+"px";

	document.getElementById("Javascript.Div1").style.left=(document.documentElement.scrollLeft+(document.documentElement.clientWidth-document.getElementById("Javascript.Div1").offsetWidth)/2)+"px";

}

</SCRIPT>



<div id="Javascript.Div2" class="div" style="width: 240px; height:90px" align="center">左上...</div>

<SCRIPT LANGUAGE="JavaScript">

function sc2(){

	document.getElementById("Javascript.Div2").style.top=(document.documentElement.scrollTop)+"px";

	document.getElementById("Javascript.Div2").style.left=(document.documentElement.scrollLeft)+"px";

}

</SCRIPT>


<div id="Javascript.Div3" class="div" style="width: 240px; height:90px" align="center">左下...</div>

<SCRIPT LANGUAGE="JavaScript">

function sc3(){

	document.getElementById("Javascript.Div3").style.top=(document.documentElement.scrollTop+document.documentElement.clientHeight-document.getElementById("Javascript.Div3").offsetHeight)+"px";

	document.getElementById("Javascript.Div3").style.left=(document.documentElement.scrollLeft)+"px";

}

</SCRIPT>


<div id="Javascript.Div4" class="div" style="width: 240px; height:90px" align="center">右上...</div>

<SCRIPT LANGUAGE="JavaScript">

function sc4(){

	document.getElementById("Javascript.Div4").style.top=(document.documentElement.scrollTop)+"px";

	document.getElementById("Javascript.Div4").style.left=(document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("Javascript.Div4").offsetWidth)+"px";

}

</SCRIPT>


<div id="Javascript.Div5" class="div" style="width: 240px; height:90px" align="center">右下...</div>

<SCRIPT LANGUAGE="JavaScript">

function sc5(){

	document.getElementById("Javascript.Div5").style.top=(document.documentElement.scrollTop+document.documentElement.clientHeight-document.getElementById("Javascript.Div5").offsetHeight)+"px";

	document.getElementById("Javascript.Div5").style.left=(document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("Javascript.Div5").offsetWidth)+"px";

}

</SCRIPT>



<SCRIPT LANGUAGE="JavaScript">

div层开始时是固定不动的,单击按钮后却随滚动条动了是咋回事啊

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