#fenster {width: 1400px; background: black; margin: auto;}
#rahmen {border: solid #000000 1px; padding: 5px; width: 1400px; margin:auto;}
#head {width: 1400px; height: 120px; background: #bfe2f9;}
#main {width: 1400px; height: 3900px; background: #8dcb41;}
#left {float: left; width: 1000px; height: 3900px; background: #feede3; font-size: 14px;}
#right {float: right; width: 400px; height: 3900px; background: #e7573b;} 
#footer {width: 1400px; height: 50px; background: #fffbc6; margin: auto;}
   
 <style type="text/css">
    #menu {
       
        position:absolute;
    }
    #menu ul {
        list-style-type:none;
        list-style-image:none;
        margin:0;
        padding:0;

    }

    #menu li.topmenu {
        float:left;
    }

    .topmenu a {
        float:left;
 font-size: 14px; font-family:calibri;
        width:130px;
        text-align:center;
    }

    .topmenu ul{
        display:none;
    }

    .topmenu a, .submenu a{
        padding:6px;
        color:white;
        font-weight:bold;
        text-decoration:none;
        background-color:#005796;
        margin:0;
    }

    .submenu a{
        font-size:13px;
        width:130px;
        position:relative;
        clear:both; /* special IE6 */
    }

    #menu a:hover, .topmenu.on a {
        color:white;
        background-color:#BF7818 !important;
    }

    .topmenu:hover ul {
        display:block;
        z-index:500;
    }

</style>