[CSS] Links gehen im IE nicht

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ul#Navigation {
    font-size: 0.8em;
    float: left; width: 170px;
    margin: -30px 0 1.2em; padding: 0;
    border: 1px solid black;
    background-image:url(menuebalken.jpg);
  }
  ul#Navigation li {
    list-style: none;
    margin: 0; padding: 0.5em;
  }
  ul#Navigation a {
    display: block;
    padding: 0.2em;
    font-weight: bold;
  }
  ul#Navigation a:link {
    color: black;
  }
  ul#Navigation a:visited {
    color: black;
  }
  ul#Navigation a:hover {
    color: black; background-color: #EFFFE5;
  }
  ul#Navigation a:active {
    color: black;

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