左上角的菜单

这是第二个菜单的内容

菜单二

这是第三个菜单的内容
菜单三

下面为效果显示

脚本说明:
把如下代码加入<body>区域中
<style type="text/css">
#divMenu0 {position:absolute; top:0px; left:30px; visibility:hidden; font-family:arial,helvetica,sans-serif; font-size:18px; font-weight:bold;}
#divMenu1 {position:absolute; top:0px; left:150px; visibility:hidden; font-family:arial,helvetica,sans-serif; font-size:18px; font-weight:bold;}
#divMenu2 {position:absolute; top:0px; left:250px; visibility:hidden; font-family:arial,helvetica,sans-serif; font-size:18px; font-weight:bold;} 
</style>
<script language="JavaScript" type="text/javascript">
function lib_bwcheck(){ //Browsercheck (needed)
	this.ver=navigator.appVersion
	this.agent=navigator.userAgent
	this.dom=document.getElementById?1:0
	this.opera5=this.agent.indexOf("Opera 5")>-1
	this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
	this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
	this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
	this.ie=this.ie4||this.ie5||this.ie6
	this.mac=this.agent.indexOf("Mac")>-1
	this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
	this.ns4=(document.layers && !this.dom)?1:0;
	this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
	return this
}
var bw=new lib_bwcheck()
//How many pixels should it move every step? 
var tMove=10;

//At what speed (in milliseconds, lower value is more speed)
var tSpeed=40

//Do you want it to move with the page if the user scroll the page?
var tMoveOnScroll=true

//How much of the menu should be visible in the in state?
var tShow=20

/********************************************************************
Contructs the menuobjects -Object functions
*********************************************************************/
function makeMenu(obj,nest,show,move,speed){
    nest=(!nest) ? "":'document.'+nest+'.'
	this.el=bw.dom?document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):0;
  	this.css=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+'document.'+obj):0;		
	this.x=this.css.left||this.css.pixelLeft||this.el.offsetLeft||0
	this.y=this.css.top||this.css.pixelTop||this.el.offsetTop||0
	this.state=1; this.go=0; this.mup=b_mup; this.show=show; this.mdown=b_mdown; 
	this.height=bw.ns4?this.css.document.height:this.el.offsetHeight
	this.moveIt=b_moveIt; this.move=move; this.speed=speed
    this.obj = obj + "Object"; 	eval(this.obj + "=this")	
}

// A unit of measure that will be added when setting the position of a layer.
var px = bw.ns4||window.opera?"":"px";

//Initing menu on pageload
onload=topMenuInit;

</script>
<div id="divMenu0">
	
	<a href="javascript://">链接一</a><br><br>
	<a href="javascript://">链接二</a><br><br>
	<a href="javascript://">链接三</a><br><br>
	<a href="javascript://">链接四</a><br><br>
	<a href="#" onclick="moveTopMenu(0); return false">菜单一</a>
</div>
<div id="divMenu1">
	
	这是第二个菜单的内容<br><br>
	<a href="#" onmouseover="moveTopMenu(1)">菜单二</a>
</div>
<div id="divMenu2">
	
	这是第三个菜单的内容<br>
	<a href="#" onclick="moveTopMenu(2); return false">菜单三</a>
</div>