CSS-Menü im IE8 falsch

<div class="Menu_hidden">
          <div class="Menu_move" id="Menu" style="width:0%;height:41px">
          <ul class="menu_list">
            <li id="home">
            <a href="home.php">Home</a>
            <ul class="single_list">
              <li>
                <a href="home.php">Startseite</a>
              </li>
              <li>
                <a href="www.google.com">Tsch&uuml;ss</a>
              </li>
            </ul>
            </li>
            <li id="ich">
            <a href="ich.php">Meine Wenigkeit</a>
            <ul class="single_list">
              <li>
                <a href="ich.php">Pers&ouml;nliches</a>
              </li>
              <li>
                <a href="kontakt.php">Kontakt</a>
              </li>
              <li>
                <a href="hobbies.php">Interessen</a>
              </li>
            </ul>
            </li>
            <li id="musik">
            <a href="musik.php">Musik</a>
            <ul class="single_list">
              <li>
                <a href="elektronisches.php">Elektronisches</a>
              </li>
              <li>
                <a href="rock.php">Handgemachtes</a>
              </li>
            </ul>
            </li>  
            <li id="prog">
            <a href="Werke.php">Eigene Werke</a>
            <ul class="single_list">
              <li>
                <a href="prog.php">Programme</a>
              </li>
              <li>
                <a href="video.php">Videos</a>
              </li>
            </ul>
            </li>   
            <li id="galerie">
            <a href="bildergalerie.php">Bilder</a>
            <ul class="single_list">'
             .$galery_menu 
          .'</ul></li>   
          <li id="guestbook">
            <a href="guestbook2.php.php">G&auml;stebuch</a>
          <ul>
              <li>
                <a href="guestbook2.php.php">G&auml;stebuch</a>
              </li>
            </ul>
            </li> 
          <ul>
          </div>
          </div>

.Menu_hidden {
    margin-top: 5px;
    margin-bottom: 5px;
    width: 1000px;
    height: 40px;
}
.Menu_move {
      height: 40px;
      text-align: center;
      float: left;
      background-image:url(../bin/background/menu_bg.png);
}

.Menu {
      margin-top: 5px;
      text-align: center;
      float: left;
      background-image:url(../bin/background/menu_bg.png);
      height: 40px;
      width: 1000px;
}

.Content {
      margin-top:0px;
      margin-bottom: 0px;
      padding: 10px;
      width: 1000px;
      min-height: 700px;
      background-image:url(../bin/background/content_bg_main.png);
      background-repeat: repeat-y;
}

.page {
      width: 1000px;
      margin-left: auto;
      margin-right: auto;
      text-align: left;
}

ul.menu_list, ul.menu_list ul{
      z-index:2;
      margin-left: auto;
      margin-right: auto;
      padding: 0px;
      text-align: center;
      color: #FFBB00;
      font-weight: bold;
}

ul.menu_list li {
      padding: 0px;
      float: left;
      background-image: url(../bin/background/menu_normal.jpg);
      list-style-type: none;
      margin: 5px 5px 0px 0px;
      position: relative;
      border: 1px solid #0000EE;
      text-align: center;
      color: #FFBB00;
      font-weight: bold;
      width: 140px;
      height: 20px;
}

/*ul.menu_list li > ul {
      visibility: hidden;
      display: none;
      position: absolute;
      top: 20px;
}*/
.single_list {
      visibility: hidden;
      display: none;
      position: absolute;
      top: 20px;
}

ul.menu_list li:hover > ul {
      margin-top: 0px;
      visibility: visible;
      display: block;
}

ul.menu_list li:hover{
   background-image: url(../bin/background/menu_hover.jpg);
       color: #0000FF;
}

a:hover{
       background-image: url(../bin/background/menu_hover.jpg);
       color: #0000FF;
}