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JavaScript实现向右伸出的多级网页菜单

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">                      <html lang="en">                      <head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">                          <title>接触角测定仪</title><style type="text/css">*{padding:0;margin:0; } li{  list-style:none; } ul{  background:rgb(200,13,34);  width:250px;    float:left;     } b{  display:block;  width:500px;  height:40px;  background:rgb(24,122,173); } ul li{  height:32px;   }  ul li:hover{  height:32px;  background:orange;   } #nav1{  position:absolute; } #nav3{  position:relative;  left:0;    background:green;;  visibility:hidden; } </style>                                               </head>                      <body>        <div id="nav1">            <ul id="nav2">                <li>文学</li>                <li>艺术</li>                <li>摄影</li>            </ul>            <ul id="nav3">                <li>1-1</li>                         <li>2-1</li>                         <li>3-1</li>                 </ul>        </div><script type="text/javascript"> var focus=false; var showdiv=document.getElementById("nav3");    showdiv.onmouseover=function(){       focus=true;          this.style.visibility="visible";    }     showdiv.onmouseout=function(){     focus=false;       this.style.visibility="hidden";    }function bindToggle(index,flag){     var showdiv=   document.getElementById("nav3");                                 var delayshow= function(){     if(flag ==1 ){         showdiv.style.visibility="visible";         showdiv.style.top=index*32+"px";     }else {        if(!focus){            showdiv.style.visibility="hidden";        }          }   }   return function(){    setTimeout(delayshow,150);   } }   var menu=document.getElementById("nav2").childNodes;   var index=0;   for(var i=0;i<menu.length;i++){    if(1==menu[i].nodeType){        menu[i].onmouseover=  bindToggle.call(menu[i],index,1);        menu[i].onmouseout=  bindToggle.call(menu[i],index,0);          index++;    }           } </script>                                                </body>                      </html>