scrollTop：设置或获取位于对象最顶端和窗口中可见内容的最顶端之间的距离。
left：对象相对于页面的X坐标。
top：对象相对于页面的Y坐标
(5)屏蔽选择,右键等
<body oncontextmenu=self.event.returnValue=falseonselectstart="return false">
下面的这个小例子是 实现滚动条根据窗体的大小自动设置
<SPAN style="FONT-SIZE: 18px"><html>
<head>
<style type="text/css">
.TopDIV
{
position:absolute;
left:130px;
top:10px;
width:105;
height:30;
overflow-x:hidden;
overflow-y:auto;
float: right;
border-style.:solid;
border-width:;
border-color:red
}
.LeftDIV
{
position:absolute;
left:10px;
top:40px;
width:120;
height:60;
overflow-x:hidden;
overflow-y:hidden;
float: right;
border-style.:solid;
border-width:;
border-color:yellow
}
.MainDIV
{
position:absolute;
left:130px;
top:40px;
width:120;;
height:80;
overflow-x:auto;
overflow-y:auto;
float: right;
border-style.:solid;
border-width:;
border-color:blue
}
</style>
<script type="text/javascript" language="javascript">
function setStyle()
{
//145的由来LeftDiv的left+width+15（15是滚动条的宽度）
document.getElementById("a").style.width=document.body.clientWidth - 145;
//130的由来LeftDiv的left+width
document.getElementById("c").style.width=document.body.clientWidth - 130;
//55的由来TopDIV的top+height+15（15是滚动条的宽度）
document.getElementById("b").style.height=document.body.clientHeight - 55;
//40的由来TopDIV的top+height
document.getElementById("c").style.height=document.body.clientHeight - 40;
}
</script>
</head>
<body onresize="setStyle();" onLoad="setStyle();">
<div id='a' class="TopDIV">
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</div>
<div id='b' class="LeftDIV">
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</div>
<div id='c' onscroll="document.getElementById('b').scrollTop = this.scrollTop;document.getElementById('a').scrollLeft = this.scrollLeft;"
class="MainDIV">
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</div>
</body>
</html>
</SPAN>
