Use a simple script to implement a beautiful drop-down menu_javascript skills

html,body{
background:#000000 ;
height:100%;
font-size:12px;
font-family:Arial, Helvetica, sans-serif;
color:#333333;
margin:20px auto;
overflow:hidden;
text-align:center;}
/*menu container menu*/
div#menu{
width:100%;
height:34px;
padding:0px 0px 0px 5px;}
/*First level menu*/
div#menu div{
width:125px;
height:20px;
float:left;
text-transform:capitalize;
background:#cccccc;
padding:5px 0px 0px 0px;
margin:4px 1px 0px 0px;}
/*Secondary menu*/
div #menu div div{
width:125px;
height:20px;
border-bottom:1px #333333 solid;
background:#666666;
margin-top:-4px;
cursor:pointer;
display:none;}
/*Special style in the secondary menu (optional)*/
div#menu div div.div1{
margin-top:3px ;
border-top:1px #333333 solid;}

var menuItem=document.getElementById("menu").getElementsByTagName("div");
for(i=0;i menuItem[i].onmouseover=function(){
var subMenu=this.getElementsByTagName("div");
for(j=0;j subMenu[j].style.display="block";
subMenu[j].onmouseover=function(){this.style.background="#999999";this.style.color="# 000000";};
subMenu[j].onmouseout=function(){this.style.background="#666666";this.style.color="#333333";};}
this.style .background="#666666"};
menuItem[i].onmouseout=function(){
var subMenu=this.getElementsByTagName("div");
for(j=0;j subMenu[j].style.display="none";}
this.style.background="#cccccc"};
}