左侧的隐藏菜单，点击后显示下拉分级菜单的内容_网页特效

<html>

<head>

<title>web reference</title>

var maxmnus = 5

function opTab(){

var mnu = document.getElementById("menubar")

var arrdiv = document.getElementById("arrow")

var arrtxt = document.getElementById("arr")

if((mnu.style.display != "block") || (mnu.style.display == "")){

mnu.style.display = "block"

arrdiv.style.pixelLeft = mnu.style.width.substring(0 , mnu.style.width.length - 2)

arrtxt.innerText = "3";

} else {

mnu.style.display = "none"

arrtxt.innerText = "4";

arrdiv.style.pixelLeft = 0;

}

event.cancelBubble = true;

}

function toggleMenu(el){

for(var i = 0;i < maxmnus;i++) document.getElementById(document.getElementById("c" + i).menu).style.display = "none";

if(el.status == "closed"){

el.status = "open"

document.getElementById(el.menu).style.display = "block";

} else {

el.status = "closed"

}

function toggleSub(e){

el = document.getElementById(e)

if(el.status == "closed"){

el.style.display = "block";

el.status = "open"

} else {

el.style.display = "none";

el.status = "closed"

}

event.cancelBubble = true;

}

</script>

#menubar{
position:absolute;top:0px;left:0px;display:none;font-family:Verdana,Helvetica,Arial;font-weight:700;font-size:10px;cursor:hand;z-index:5;background-image:url();background-repeat:repeat-y;filter:progid:DXImageTransform.Microsoft.gradient(enabled='true',gradientType='1',startColorstr='#2644b2', endColorstr='#e7e8f1');}

.indicator{
color:#b24426;font-family:Webdings;font-weight:bold;font-size:10px;}

.r1{
position:relative;top:10px;left:5px;width:213px;color:#e7e8f1;border-left:#e7e8f1 2px outset;border-top:#e7e8f1 2px outset;border-right:#e7e8f1 2px outset;border-bottom:#e7e8f1 2px outset;padding-left:5px;padding-top:1px;adding-right:5px;padding-bottom:1px;background-image:url();background-repeat:repeat-y;filter:progid:DXImageTransform.Microsoft.gradient(enabled='true',gradientType='1',startColorstr='#2644b2', endColorstr='#e7e8f1');}

.submenu1{
position:relative;top:0px;left:0px;height:95%;width:100%;border-left:#e0f8e3 2px inset;border-top:#e0f8e3 2px inset;border-right:#e0f8e3 2px inset;border-bottom:#e0f8e3 2px inset;padding-left:3px;padding-top:3px;padding-right:3px;padding-bottom:3px;display:none;color:#2644b2;font-family:Verdana,Helvetica,Arial;font-weight:700;font-size:10px;background-color:#cff1d4;background-image:url();background-repeat:repeat-y;filter:progid:DXImageTransform.Microsoft.gradient(enabled='true',gradientType='1',startColorstr='#bec1e4', endColorstr='#e7e8f1');}

.submenu2{
position:relative;top:0px;left:0px;width:90%;border-left:#e0f8e3 3px groove;border-top:#e0f8e3 3px groove;border-right:#e0f8e3 3px groove;border-bottom:#e0f8e3 3px groove;padding-left:3px;padding-top:3px;padding-right:3px;padding-bottom:3px;margin-top:4px;display:none;background-color:#cff1d4;color:#2644b2;font-family:Verdana,Helvetica,Arial;font-weight:700;font-size:10px;background-image:url();background-repeat:repeat-y;filter:progid:DXImageTransform.Microsoft.gradient(enabled='true',gradientType='1',startColorstr='#bec1e4', endColorstr='#e7e8f1');}

.pulltab{
position:absolute;top:0px;left:0px;height:100%;width:20px;padding-left:2px;cursor:hand;color:#2644b2;font-family:Webdings;font-weight:bold;font-size:10px;z-index:5;background-image:url();background-repeat:repeat-y;filter:progid:DXImageTransform.Microsoft.gradient(enabled='true',gradientType='1',startColorstr='#e7e8f1', endColorstr='#2644b2');}

.inner{
height:100%;width:100%;}

.mtab{
position:relative;top:0px;

.btninner{
height:100%;width:100%;}

.fr{
position:absolute;top:0px;left:30px;}

</style>

</head>

<div id="cbtn" class="btninner">Behaviors</div>

<tr><td onclick="opTab();">DHTML Behaviours</td></tr>

<tr><td onclick="opTab();">HTC Reference</td></tr>

<tr><td onclick="opTab();">Element Behaviors</td></tr>

<tr><td onclick="toggleSub('m0s0');">ViewLink Overview<span class="indicator">6</span>

<tr><td onclick="opTab();">ViewLink CSS Inheritance</td></tr>

</table></td></tr>

<tr><td onclick="opTab();">Default Behaviors Reference</td></tr>

<tr><td onclick="opTab();">Behaviors Library</td></tr>

<tr><td onclick="opTab();">Using DHTML behaviors</td></tr>

<tr><td onclick="opTab();">Implementing DHTML Behaviors in Script Using HTML Components</td></tr>

</table>

</div>

<div>

<tr><td onclick="opTab();">A Coast-to-Coast Cascade of Style Sheets</td></tr>

<tr><td onclick="opTab();">Using Cascading Style Sheets</td></tr>

<tr><td onclick="opTab();">Controlling Presentation with Measurement and Location Properties</td></tr>

<tr><td onclick="opTab();">A User's Guide to Style Sheets</td></tr>

<tr><td onclick="opTab();">Cascading Style Sheets in Internet Explorer 4.0</td></tr>

<tr><td onclick="opTab();">New in CSS, Level 2</td></tr>

<tr><td onclick="opTab();">CSS Positioning</td></tr>

<tr><td onclick="opTab();">Linked Style Sheets</td></tr>

<tr><td onclick="opTab();">Using Vertical Layout in Internet Explorer 5.5</td></tr>

<tr><td onclick="opTab();">CSS Attributes Reference</td></tr>

<tr><td onclick="opTab();">CSS Length Units Reference</td></tr>

</table>

</div>

<div id="cbtn" class="btninner">DHTML</div>

<div>

<tr><td>DHTML 1</td></tr>

<tr><td>DHTML 2</td></tr>

<tr><td>DHTML 3</td></tr>

<tr><td>DHTML 4</td></tr>

<tr><td>DHTML 5</td></tr>

<tr><td>DHTML 6</td></tr>

<tr><td>DHTML 7</td></tr>

<tr><td>DHTML 8</td></tr>

<tr><td>DHTML 9</td></tr>

<tr><td>DHTML 10</td></tr>

<tr><td>DHTML 11</td></tr>

<tr><td>DHTML 12</td></tr>

</table>

</div>

<div>

</table>

</div>

<div>

</table>

</div>

<h2>左侧的变化菜单</h2>

<p>This menu is specifically designed for IE5.5+, there will be a version for N6+ and Mozilla 0.9.2 soon</p>

<ol>

<li>Click on the bar to the left to open or close the menu</li>

<li>Clicking on any menu item would normally display a page here and/or show a submenu indicated by a down arrow at Jon Steele's suggestion</li>

<li>The fourth item of the "Behavoirs" menu, "Viewlink Overview" has a sub-menu.</li>

<li>No menu will remain open if another is clicked</li>

<li>Clicking on the same menu item toggles it open or closed accordingly</li>

<li>Selection of a link closes the menu automatically</li>

<li>The IE 5.5 version, uses no images, the colouration is from a behavior that requires 5.5</li>

<li>The 5.0 version uses 2 small jpg but are of lesser quality.</li>

<li>This menu is designed, primarily, for dynamic page. The adat for the page would either be placed here via XML or arrays or document/write method.

</ol>

</div>