.centerme {  
    width: 770px;  
    height: 525px;  
    position: absolute;  
    left: 50%;  
    top: 50%;  
    margin-left: -395px;  
    margin-top: -270px;  
}  

<!--[if IE]>
<STYLE type="text/css">
#container { position: relative; }
#position { position: absolute; top: 50%; }
#content { position: relative; top: -50%; }
</STYLE>
<![endif]-->


<STYLE type="text/css">
#container { width: 100%; height: 100%; display: table; }
#position { display: table-cell; vertical-align: middle; width: 100%; text-align: center; }
</STYLE>