左侧的隐藏菜单，点击后显示下拉分级菜单的内

<br>   <html> <head> <title>web reference</title> <script language="JavaScript1.2" type="text/javascript"> 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> <style type="text/css"> #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> <body scroll="no"> <div id="menubar" style="; HEIGHT: expression(document.body.offsetHeight); WIDTH: 223px"> <div id="c0" class="r1" onclick="toggleMenu(this)" status="closed" menu="m0"> <div id="cbtn" class="btninner">Behaviors</div> <div class="mtab"> <table id="m0" class="submenu1" align="center" border="0" cellspacing="0" cellpadding="0"> <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> <table id="m0s0" class="submenu2" align="center" border="0" cellspacing="0" cellpadding="0" status="closed"> <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> <div id="c1" class="r1" onclick="toggleMenu(this)" status="closed" menu="m1"> <div id="cbtn" class="btninner">CSS</div> <div> <table id="m1" class="submenu1" align="center" border="0" cellspacing="0" cellpadding="0"> <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> <tr><td onclick="opTab();">Tips</td></tr> </table> </div> </div> <div id="c2" class="r1" onclick="toggleMenu(this)" status="closed" menu="m2"> <div id="cbtn" class="btninner">DHTML</div> <div> <table id="m2" class="submenu1" align="center" border="0" cellspacing="0" cellpadding="0"> <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> <div id="c3" class="r1" onclick="toggleMenu(this)" status="closed" menu="m3"> <div id="cbtn" class="btninner">DOM</div> <div> <table id="m3" class="submenu1" align="center" border="0" cellspacing="0" cellpadding="0"> <tr><td>DOM 1</td></tr> <tr><td>DOM 2</td></tr> <tr><td>DOM 3</td></tr> <tr><td>DOM 4</td></tr> <tr><td>DOM 5</td></tr> <tr><td>DOM 6</td></tr> <tr><td>DOM 7</td></tr> <tr><td>DOM 8</td></tr> <tr><td>DOM 9</td></tr> <tr><td>DOM 10</td></tr> <tr><td>DOM 11</td></tr> <tr><td>DOM 12</td></tr> </table> </div> </div> <div id="c4" class="r1" onclick="toggleMenu(this)" status="closed" menu="m4"> <div id="cbtn" class="btninner">HTML</div> <div> <table id="m4" class="submenu1" align="center" border="0" cellspacing="0" cellpadding="0"> <tr><td>HTML 1</td></tr> <tr><td>HTML 2</td></tr> <tr><td>HTML 3</td></tr> <tr><td>HTML 4</td></tr> <tr><td>HTML 5</td></tr> <tr><td>HTML 6</td></tr> <tr><td>HTML 7</td></tr> <tr><td>HTML 8</td></tr> <tr><td>HTML 9</td></tr> <tr><td>HTML 10</td></tr> <tr><td>HTML 11</td></tr> <tr><td>HTML 12</td></tr> </table> </div> </div> </div> <div id="arrow" class="pulltab" onclick="opTab()"><table class="inner"><tr><td id="arr" valign="middle">4</td></tr></table></div> <div id="fr" name="fr" class="fr"> <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>

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左侧的隐藏菜单，点击后显示下拉分级菜单的内