Step 1: Go to your template codedashboard>>design>>edit HTML. Now click the box named Expand widget template. Search for <body>and in paste this code after it or above <div id='outer-wrapper'>:
<link href='http://dl.dropbox.com/u/11103024/menu.css' media='screen' rel='stylesheet' type='text/css'/>
<b:section id='menu' maxwidgets='1' showaddelement='no'>
<b:widget id='HTML91' locked='false' title='Menu' type='HTML'/>
</b:section>Step 2: Now, you can come back "Page Elements" and Past this code in new widget:
<ul class="menu">
<li class="no_drop"><a href="#">Home</a></li>
<li><a href="#" class="drop">1 Column</a>
<div class="dropdown_1column">
<div class="col_1">
<ul>
<li><a href="#">FreelanceSwitch</a></li>
<li><a href="#">Creattica</a></li>
<li><a href="#">WorkAwesome</a></li>
<li><a href="#">Mac Apps</a></li>
<li><a href="#">Web Apps</a></li>
<li><a href="#">NetTuts</a></li>
<li><a href="#">Design</a></li>
<li><a href="#">Logo</a></li>
<li><a href="#">Flash</a></li>
<li><a href="#">Illustration</a></li>
<li><a href="#">More...</a></li>
</ul>
</div></div></li>
<li><a href="#" class="drop">2 columns</a>
<div class="dropdown_2columns">
<div class="col_1">
<h3>Some Links</h3>
<ul>
<li><a href="#">ThemeForest</a></li>
<li><a href="#">GraphicRiver</a></li>
<li><a href="#">ActiveDen</a></li>
</ul>
</div>
<div class="col_1">
<h3>Useful Links</h3>
<ul>
<li><a href="#">NetTuts</a></li>
<li><a href="#">VectorTuts</a></li>
<li><a href="#">PsdTuts</a></li>
</ul>
</div>
<div class="col_1">
<h3>Other Stuff</h3>
<ul>
<li><a href="#">FreelanceSwitch</a></li>
<li><a href="#">Creattica</a></li>
<li><a href="#">WorkAwesome</a></li>
</ul>
</div>
<div class="col_1">
<h3>Misc</h3>
<ul>
<li><a href="#">Design</a></li>
<li><a href="#">Logo</a></li>
<li><a href="#">Flash</a></li>
</ul>
</div></div></li></ul>