给一个Div层添加滚动条功能

答案：<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>带滚动条的Div</title>
	<style type="text/css">
	body{
		font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;
	}
	p{
		margin-top:0px;
	}
	#dhtmlgoodies_scrolldiv{
		width:530px;
		height:500px;
	}
	#scrolldiv_parentContainer{
		width:500px;
		height:100%;
		overflow:hidden;
		border:1px solid #BC8FBD;
		float:left;
		position:relative;
	}
		#scrolldiv_content{
		padding: 5px;
		position:relative;
		font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;
		font-size: 0.9em;
		line-height:130%;
		color: #333;
	}
	
		#scrolldiv_slider{
		width:15px;
		margin-left:2px;
		height:500px;
		float:left;
	}
	
		#scrolldiv_scrollbar{
		width:15px;
		height:460px;
		border:1px solid #BC8FBD;
		position:relative;
		
	}
		#scrolldiv_theScroll{
		margin:1px;
		width:13px;
		height:13px;
		background-color:#BC8FBD;
		position:absolute;	
		top:0px;
		left:0px;
		cursor:pointer;
	}
		#scrolldiv_scrollUp,#scrolldiv_scrollDown{
		width:15px;
		height:16px;
		border:1px solid #BC8FBD;
		color: #BC8FBD;
		text-align:center;
		font-size:16px;
		line-height:16px;
		cursor:pointer;
	}
	#scrolldiv_scrollUp{
		margin-bottom:2px;
	}
	#scrolldiv_scrollDown{
		margin-top:2px;
	}
	#scrolldiv_scrollDown span,#scrolldiv_scrollUp span{
		font-family: Symbol;
	}

	</style>
	<script type="text/javascript">
	var contentHeight = 0;
	var visibleContentHeight = 0;	
	var scrollActive = false;
	var scrollHandleObj = false;
	var scrollHandleHeight = false;
	var scrollbarTop = false;
	var eventYPos = false;
	var scrollbuttonActive = false;
	var scrollbuttonDirection = false;
	var scrollbuttonSpeed = 2;
	var scrollTimer = 10;	
	var scrollMoveToActive = false;
	var scrollMoveToYPosition = false;
	function scrollDiv_startScroll(e)
	{
		if(document.all)e = event;
		scrollbarTop = document.getElementById('scrolldiv_theScroll').offsetTop;
		eventYPos = e.clientY;
		scrollActive = true;
	}
	
	function scrollDiv_stopScroll()
	{
		scrollActive = false;
		scrollbuttonActive = false;
		scrollMoveToActive = false;
	}
	function scrollDiv_scroll(e)
	{
		if(!scrollActive)return;
		if(document.all)e = event;
		if(e.button!=1 && document.all)return;
		var topPos = scrollbarTop + e.clientY - eventYPos; 
		if(topPos<0)topPos=0;
		if(topPos/1>visibleContentHeight-(scrollHandleHeight+4)/1)topPos = visibleContentHeight-(scrollHandleHeight+4);
		document.getElementById('scrolldiv_theScroll').style.top = topPos + 'px';
		document.getElementById('scrolldiv_content').style.top = 0 - Math.floor((contentHeight) * ((topPos)/(visibleContentHeight-scrollHandleHeight)))+'px' 
	}
	function scrolldiv_scrollMoveToInit(e)
	{		
		if(document.all)e = event;
		scrollMoveToActive = true;
		scrollMoveToYPosition = e.clientY - document.getElementById('scrolldiv_scrollbar').offsetTop;
		if(document.getElementById('scrolldiv_theScroll').offsetTop/1 > scrollMoveToYPosition) scrollbuttonDirection = scrollbuttonSpeed*-2; else  scrollbuttonDirection = scrollbuttonSpeed*2;
		scrolldiv_scrollMoveTo();	
	}
	
	function scrolldiv_scrollMoveTo()
	{
		if(!scrollMoveToActive || scrollActive)return;
		var topPos = document.getElementById('scrolldiv_theScroll').style.top.replace('px','');
		topPos = topPos/1 + scrollbuttonDirection;
		if(topPos<0){
			topPos=0;
			scrollMoveToActive=false;
		}
		if(topPos/1>visibleContentHeight-(scrollHandleHeight+4)/1){
			topPos = visibleContentHeight-(scrollHandleHeight+4);	
			scrollMoveToActive=false;
		}
		if(scrollbuttonDirection<0 && topPos<scrollMoveToYPosition-scrollHandleHeight/2)return;	
		if(scrollbuttonDirection>0 && topPos>scrollMoveToYPosition-scrollHandleHeight/2)return;			
		document.getElementById('scrolldiv_theScroll').style.top = topPos + 'px';
		document.getElementById('scrolldiv_content').style.top = 0 - Math.floor((contentHeight) * ((topPos)/(visibleContentHeight-scrollHandleHeight)))+'px' 		
		setTimeout('scrolldiv_scrollMoveTo()',scrollTimer);		
	}
	
	function cancelEvent()
	{
		return false;			
	}

	function scrolldiv_scrollButton()
	{
		if(this.id=='scrolldiv_scrollDown')scrollbuttonDirection = scrollbuttonSpeed; else scrollbuttonDirection = scrollbuttonSpeed*-1;
		scrollbuttonActive=true;
		scrolldiv_scrollButtonScroll();
	}
	function scrolldiv_scrollButtonScroll()
	{
		if(!scrollbuttonActive)return;
		var topPos = document.getElementById('scrolldiv_theScroll').style.top.replace('px','');
		topPos = topPos/1 + scrollbuttonDirection;
		if(topPos<0){
			topPos=0;
			scrollbuttonActive=false;
		}
		if(topPos/1>visibleContentHeight-(scrollHandleHeight+4)/1){
			topPos = visibleContentHeight-(scrollHandleHeight+4);	
			scrollbuttonActive=false;
		}	
		document.getElementById('scrolldiv_theScroll').style.top = topPos + 'px';
		document.getElementById('scrolldiv_content').style.top = 0 - Math.floor((contentHeight) * ((topPos)/(visibleContentHeight-scrollHandleHeight)))+'px' 			
		setTimeout('scrolldiv_scrollButtonScroll()',scrollTimer);
	}
	function scrolldiv_scrollButtonStop()
	{
		scrollbuttonActive = false;
	}
	
	
	function scrolldiv_initScroll()
	{
		visibleContentHeight = document.getElementById('scrolldiv_scrollbar').offsetHeight ;
		contentHeight = document.getElementById('scrolldiv_content').offsetHeight - visibleContentHeight;			scrollHandleObj = document.getElementById('scrolldiv_theScroll');
		scrollHandleHeight = scrollHandleObj.offsetHeight;
		scrollbarTop = document.getElementById('scrolldiv_scrollbar').offsetTop;		
		document.getElementById('scrolldiv_theScroll').onmousedown = scrollDiv_startScroll;
		document.body.onmousemove = scrollDiv_scroll;
		document.getElementById('scrolldiv_scrollbar').onselectstart = cancelEvent;
		document.getElementById('scrolldiv_theScroll').onmouseup = scrollDiv_stopScroll;
		if(document.all)document.body.onmouseup = scrollDiv_stopScroll; else
document.documentElement.onmouseup = scrollDiv_stopScroll;
		document.getElementById('scrolldiv_scrollDown').onmousedown = scrolldiv_scrollButton;
		document.getElementById('scrolldiv_scrollUp').onmousedown = scrolldiv_scrollButton;
		document.getElementById('scrolldiv_scrollDown').onmouseup = scrolldiv_scrollButtonStop;
		document.getElementById('scrolldiv_scrollUp').onmouseup = scrolldiv_scrollButtonStop;
		document.getElementById('scrolldiv_scrollUp').onselectstart = cancelEvent;
		document.getElementById('scrolldiv_scrollDown').onselectstart = cancelEvent;
		document.getElementById('scrolldiv_scrollbar').onmousedown = scrolldiv_scrollMoveToInit;
	}
	function scrolldiv_setColor(rgbColor)
	{
		document.getElementById('scrolldiv_scrollbar').style.borderColor = rgbColor;
		document.getElementById('scrolldiv_theScroll').style.backgroundColor = rgbColor;
		document.getElementById('scrolldiv_scrollUp').style.borderColor = rgbColor;
		document.getElementById('scrolldiv_scrollDown').style.borderColor = rgbColor;
		document.getElementById('scrolldiv_scrollUp').style.color = rgbColor;
		document.getElementById('scrolldiv_scrollDown').style.color = rgbColor;
		document.getElementById('scrolldiv_parentContainer').style.borderColor = rgbColor;
	}

	function scrolldiv_setWidth(newWidth)
	{
		document.getElementById('dhtmlgoodies_scrolldiv').style.width = newWidth + 'px';
		document.getElementById('scrolldiv_parentContainer').style.width = newWidth-30 + 'px';		
	}
	
	function scrolldiv_setHeight(newHeight)
	{
		document.getElementById('dhtmlgoodies_scrolldiv').style.height = newHeight + 'px';
		document.getElementById('scrolldiv_parentContainer').style.height = newHeight + 'px';
		document.getElementById('scrolldiv_slider').style.height = newHeight + 'px';
		document.getEl
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