模似windows XP 左侧的菜单效果

<style type="text/css">

.mainDiv
{
width:160px;
}
.topItem
{
width:160px;
height:22px;
cursor:pointer;
background: #467BF2;
text-decoration: none;
color: white;
font-weight:bold;
font-family:"GOTHIC";

}
.dropMenu
{
background:#D9D9D9;
border-top:1px solid #467BF2;
border-left:1px solid #92B1F8;
border-right:1px solid #92B1F8;
border-bottom:1px solid #92B1F8;
}
.subMenu
{
display:none;
}
.subItem
{
padding-left:5px;
cursor:pointer;
font-weight:bold;
text-decoration:none;
color:black;
}
.subItem a
{
text-decoration:none;
color:black;
}
.subItemOver
{
cursor:pointer;
color:blue;
text-decoration:underline;
font-weight:bold;
padding-left:5px;
}
.subItemOver a
{
color:blue;
}
.drop
{
border-left:1px solid black;
border-right:1px solid black;
}
</style>
<script language="javascript">
var TIMER_SLIDE = null;
var OBJ_SLIDE;
var OBJ_VIEW;
var PIX_SLIDE = 10; //this is the amount of slide/DELAY_SLIDE
var NEW_PIX_VAL;
var DELAY_SLIDE = 30; //this is the time between each call to slide
var DIV_HEIGHT = 22; //value irrelevant
var SUB_MENU_NUM =0;
var RE_INIT_OBJ = null;
var bMenu = document.getElementById("curMenu");
var MainDiv,SubDiv
//DD added code
document.write('<div id="tempcontainer" class="mainDiv" style="visibility: hidden; position: absolute"></div>')
function Init(objDiv)
{
if (TIMER_SLIDE == null)
{
SUB_MENU_NUM = 0;
MainDiv = objDiv.parentNode;
SubDiv = MainDiv.getElementsByTagName("DIV").item(0);
SubDiv.onclick = SetSlide;

OBJ_SLIDE = MainDiv.getElementsByTagName("DIV").item(1)
OBJ_VIEW = OBJ_SLIDE.getElementsByTagName("DIV").item(0);
document.getElementById("tempcontainer").innerHTML=MainDiv.getElementsByTagName("DIV").item(2).innerHTML //DD added code
DIV_HEIGHT=document.getElementById("tempcontainer").offsetHeight //DD added code

for (i=0;i<OBJ_VIEW.childNodes.length;i++)
{
if (OBJ_VIEW.childNodes.item(i).tagName == "SPAN")
{
SUB_MENU_NUM ++;
OBJ_VIEW.childNodes.item(i).onmouseover= ChangeStyle;
OBJ_VIEW.childNodes.item(i).onmouseout= ChangeStyle;
}
}

NEW_PIX_VAL = parseInt(MainDiv.getAttribute("state"));
}
}
function SetSlide()
{
if (window.TIMER_SLIDE) clearInterval(TIMER_SLIDE) //DD added code
if (TIMER_SLIDE == null && this.parentNode == MainDiv)
TIMER_SLIDE = setInterval('RunSlide()', DELAY_SLIDE);
else
{
RE_INIT_OBJ = this;
setTimeout('ReInit()', 200);
}
}
function ReInit(obj)
{
Init(RE_INIT_OBJ);
TIMER_SLIDE = setInterval('RunSlide()', DELAY_SLIDE);
RE_INIT_OBJ = null;
}
function RunSlide()
{
if (OBJ_VIEW.getAttribute("state") == 0)
{
NEW_PIX_VAL += PIX_SLIDE;
OBJ_SLIDE.style.height = NEW_PIX_VAL;
if (NEW_PIX_VAL >= DIV_HEIGHT) //DD modified code
{
clearInterval(TIMER_SLIDE);
TIMER_SLIDE = null;
OBJ_VIEW.style.display = 'inline';
OBJ_VIEW.setAttribute("state","1")
MainDiv.setAttribute("state",NEW_PIX_VAL);
}
} else
{
OBJ_VIEW.style.display = 'none';
NEW_PIX_VAL -= PIX_SLIDE;
if(NEW_PIX_VAL > 0)OBJ_SLIDE.style.height = NEW_PIX_VAL;
if (NEW_PIX_VAL <= 0)
{
NEW_PIX_VAL = 0;
OBJ_SLIDE.style.height = NEW_PIX_VAL
clearInterval(TIMER_SLIDE);
TIMER_SLIDE = null;
OBJ_VIEW.setAttribute("state","0")
MainDiv.setAttribute("state",NEW_PIX_VAL);
}
}
}
function ChangeStyle()
{
if (this.className == this.getAttribute("classOut"))
this.className = this.getAttribute("classOver");
else
this.className = this.getAttribute("classOut");
}
</script>
<!--------Start Menu---------->
<div class="mainDiv" state="0">
<div class="topItem" classOut="topItem" classOver="topItemOver" onMouseOver="Init(this);" >网页特效</div>
<div class="dropMenu" >
<div class="subMenu" state="0">
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/javascript.asp?type=图形图像">图形图像</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/javascript.asp?type=鼠标事件">鼠标事件</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/javascript.asp?type=时间日期">时间日期</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/javascript.asp?type=导航菜单">导航菜单</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/javascript.asp?type=文字效果">文字效果</a></span>
</div>
</div>
</div>
<!--------End Menu---------->
<BR />
<!--------Start Menu---------->
<div class="mainDiv" state="0">
<div class="topItem" classOut="topItem" classOver="topItemOver" onMouseOver="Init(this)" >网络学院</div>
<div class="dropMenu" >
<div class="subMenu" state="0">
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/study.asp?type=网页制作">网页制作</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/study.asp?type=网络编程">网络编程</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/study.asp?type=图形图像">图形图像</a></span>
</div>
</div>
</div>
<!--------End Menu---------->
<BR />
<!--------Start Menu---------->
<div class="mainDiv" state="0">
<div class="topItem" classOut="topItem" classOver="topItemOver" onMouseOver="Init(this)" >网站联盟</div>
<div class="dropMenu" >
<div class="subMenu" state="0">
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/webmeng_show.asp?type=1">网页设计</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/webmeng_show.asp?type=2">艺术创作</a></span><BR />
<span class="subItem" classOut="subItem" classOver="subItemOver"><a href="http://www.smallrain.net/webmeng_show.asp?type=3">电脑网络</a></span>
</div>
</div>
</div>
<!--------End Menu---------->