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<script src="http://lehoanganh.googlecode.com/files/show_layer.js"></script>

#middlebar{
font-size:11px;
color:#3b5d14;
background:#90b557;
font-weight:bold;
padding:4px;
height:30px;
}
#middlebar .menu li {
background:url(lm.png) left top no-repeat;
height:30px;
float:left;
margin-right:10px;
}
#middlebar .menu li a{
color:#3b5d14;
text-decoration:none;
padding:0 10px;
height:30px;
line-height:30px;
display:block;
float:left;
padding:0 26px 0 10px;
background:url(rm.png) right top no-repeat;
}
#middlebar .menu li a:hover{
color:#666666;
}
#middlebar ul .submenu {
border:solid 1px #c9dea1;
border-top:none;
background:#FFFFFF;
position: relative;
top: 4px;
width:150px;
padding:6px 0;
clear:both;
z-index:2;
display:none;
}
#middlebar ul .submenu li{
background:none;
display:block;
float:none;
margin:0 6px;
border:0;
height:auto;
line-height:normal;
border-top:solid 1px #DEDEDE;
}
#middlebar .submenu li a{
background:none;
display:block;
float:none;
padding:6px 6px;
margin:0;
border:0;
height:auto;
color:#105cbe;
line-height:normal;
}
#middlebar .submenu li a:hover{
background:#e3edef;
}

<div id="middlebar">

<ul class="menu">
<li><a href="#" onclick="javascript:showlayer('sm_1')">Home</a></li>
<li><a href="#" onclick="javascript:showlayer('sm_2')">Blog Tips</a></li>
<li><a href="#" onclick="javascript:showlayer('sm_3')">Web Design</a></li>

<ul class="submenu" id="sm_1">
<li><a href="asd">About</a></li>
<li><a href="asd">Contact </a></li>
<li><a href="asd">RSS</a></li>
</ul>

<ul class="submenu" id="sm_2">
<li><a href="asd">Basic</a></li>
<li><a href="asd">Tips</a></li>
<li><a href="asd">Hack & Design</a></li>
</ul>

<ul class="submenu" id="sm_3">
<li><a href="asd">HTML</a></li>
<li><a href="asd">CSS</a></li>
<li><a href="asd">Java</a></li>
</ul>
</ul>
</div>