[Resolvido] Centralizar Menu

Opa

Preciso centralizar este menu e nao estou conseguindo.

Este é o código HTML:

<div class="menu">
 <ul class="blockeasing">
 <li class="main"><a href="#">Principal</a></li>
 <li class="main"><a href="#">Sobre Nós</a></li>
 <li class="main"><a href="#">Produtos</a>
 <ul class="subnav">
 <li><a href="#">Tanques</a></li>
 <li><a href="#">Puçá</a></li>
 <li><a href="#">Balança</a></li>
 <li><a href="#">Balaio</a></li>
 <li><a href="#">Classificadores</a></li>
 <li><a href="#">Outros</a></li>
 </ul>
 </li>
 <li class="main"><a href="#">Serviços</a></li>
 <li class="main"><a href="#">Contato</a></li>
 </ul>
 </div>

E este o CSS:

div.menu{

 height:100px;
 position:relative;
 width:900px;
 z-index:1000;

}

ul.blockeasing {

 position:relative;
 color:#CCCCCC;
 float:left;
 font-size:11px;
 padding:7px;
 width:900px;
 margin-left:auto;
 margin-right:auto;
 margin-top:0;
 display: table;
}

ul.blockeasing li{

 background:none repeat scroll 0 0 #333333;
 border:1px solid #060;
 display:block;
 float:left;
 height:15px;
 list-style:none outside none;
 margin:0 5px;
 padding:7px 1px;
 text-align:center;
 text-shadow:0 1px 1px #000000;
 text-transform:uppercase;
 width:130px;
}

ul.blockeasing li.main{

 height:18px;
 position:relative;
}

ul.blockeasing li a{

 color:#CCC;
}

ul.blockeasing li ul.subnav{

background:none repeat scroll 0 0 #333;
border-bottom:2px solid #20603d;
float:left;
position:absolute;
left:-50%;
width:250px;
height:250px;
margin-top:15px;
display:none;
padding-top: 0px;
padding-right: 5px;
padding-bottom: 0;
padding-left: 5px;
 }

ul.blockeasing li ul li{

 border:none;
 border-bottom:1px solid #dca84b;
 padding:5px;
 float:left;
 width:100px;
height:7px;
 overflow:visible
 }

Podem me ajudar??