body { height:100%; margin:0; padding:0;}

#menu {	
left:0;
bottom:0;
width:100%;
height:25px;

border-top:0px;
z-index:4;    
background-color:#cccccc;   

filter:alpha(opacity=50);
-moz-opacity:.50;
opacity:.50;
}

body>#rahmen { padding-top:25px; }
body>#menu { position:fixed; }    
body>#inhalt { position:static; }