<style type="text/css">
  #mainDiv{
    overflow:hidden;
    position:relative;
    /* dalsze definicje */
  }
  #menu{
    position:absolute;
    width:9ex;
    left:-60px;
    top:40px;
    /* dalsze definicje */
  }
  #menuTitle{
    border-bottom: 1px solid black;
  }
  .menuitem{
    cursor:pointer;
  }
  .menuitem:hover{
    background-color:#E0E0E0;
  }
</style>