Problem mit absoluter Positionoerung im IE

<ul id="navigation">
            <li class="active"><a href="#">Zieloptiken</a></li>
            <li><a href="#">Montagen</a>
                <div>
                    <ul>
                        <li><h4><a href="#">Kategorie</a></h4></li>
                        <li><a href="#">Link 1</a></li>
                        <li><a href="#">Link 1</a></li>
                    </ul>
                    <ul>
                        <li><h4><a href="#">Kategorie</a></h4></li>
                        <li><a href="#">Link 1</a></li>
                        <li><a href="#">Link 1</a></li>
                    </ul>
                    <ul>
                        <li><h4><a href="#">Kategorie</a></h4></li>
                        <li><a href="#">Link 1</a></li>
                        <li><a href="#">Link 1</a></li>
                    </ul>
                    <div class="clear"></div>
                </div>
            </li>
            <li><a href="#">Optiken</a></li>
            <li><a href="#">Ausrüstung</a></li>
            <li><a href="#">Sonstiges</a></li>
            <li><a href="#" class="deals">Schnäppchen</a></li>
            <li><a href="#" class="novelties">Neuheiten</a></li>
            <div class="clear"></div>
        </ul><!-- Navigation End -->

ul#navigation {
    margin: 0 auto;
    margin-bottom: 10px;
    padding: 0 40px;
    list-style-type: none;
    width: 960px;/*1040*/
    background-color: #fff;
    -moz-box-shadow: 0 0 4px 2px #929292;
    -webkit-box-shadow: 0 0 4px 2px #929292;
    box-shadow: 0 0 4px 2px #929292;
    zoom: 1;
    filter: progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=0, Strength=4)
    progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=45, Strength=3)
    progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=90, Strength=4)
    progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=135, Strength=3)
    progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=180, Strength=4)
    progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=225, Strength=3)
    progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=260, Strength=4)
    progid:DXImageTransform.Microsoft.Shadow(color='#a1a1a1', Direction=305, Strength=3);
}
ul#navigation li {
    float: left;
    position: relative;
    z-index: 10;
    margin-right: 20px;
}
ul#navigation li a {
    padding: 0 10px;
    display: block;
    font-weight: bold;
    font-size: 1.25em;/*15*/
    line-height: 35px;/*35*/
    text-align: left;
    color: #3c3c3c;
    background: yellow;
}
ul#navigation li a:hover, ul#navigation li.active a {
    color: #fff;
    background: #f38417; /* Old browsers */
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(top, #f38417 0%, #e15e24 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#f38417), color-stop(100%,#e15e24)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, #f38417 0%,#e15e24 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, #f38417 0%,#e15e24 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, #f38417 0%,#e15e24 100%); /* IE10+ */
    background: linear-gradient(to bottom, #f38417 0%,#e15e24 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f38417', endColorstr='#e15e24',GradientType=0 ); /* IE7-8 */
    -ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#f38417', endColorstr='#e15e24'); /* IE6 */
}
ul#navigation li:hover {
    z-index: 20;
}
ul#navigation li > div {
    display: none;
    position: absolute;
    top: 35px;
    left: 0;
    z-index: 10;
    padding: 10px 0;
    background-color: #fff;
    border: 1px solid #f0f0f0;
    border-top: none;
    opacity: 0.97;
    -moz-opacity: 0.97;
    -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=97)";
    filter:alpha(opacity=97);
}
ul#navigation li:hover > div {
    display: block;
}
ul#navigation li ul {
    margin: 0;
    padding: 0 10px;
    width: 199px;/*220*/
    list-style-type: none;
    border-right: 1px solid #f0f0f0;
    float: left;
}
ul#navigation li ul li {
    float: none;
    margin: 0;
    padding: 0;
}