no me abre el menu

Hola hice este menu pero no me abre en ie pero en firefox si se despliega necesito esa ayudadita porfavor

Código :

<div class="nav-container-outer">
   <img src="images/nav-bg-l.jpg" alt="" class="float-left" />
   <img src="images/nav-bg-r.jpg" alt="" class="float-right" />
   <ul id="nav-container" class="nav-container">
      <li><a href="index.html" target="_parent" class="item-primary">Inicio</a>     </li>
     
     <li><span class="divider divider-vert" ></span></li>
      <li><a href="mision.html" target="_parent" class="item-primary">Mision</a>     
     
     <ul style="width:150px;">
      <li><a href="perfiles.html" target="_parent">Perfiles</a></li>
     <li><a href="evalucacioncurricular.html" target="_parent">Evaluacion Curricular</a></li>
      <li><a href="reformacurricular.html" target="_parent">Reforma Curricular</a></li>
     </ul></li>
         
      <li><span class="divider divider-vert" ></span></li>
      <li><a href="vision.html" target="_parent" class="item-primary">Vision</a>      </li>
     
     <li><span class="divider divider-vert" ></span></li>
      <li><a href="qn.html" target="_parent" class="item-primary">Quienes Somos</a>      
     
     <ul style="width:150px;">
      <li><a href="filosofia.html" target="_parent">Filosofia</a></li>
     <li><a href="psicopedagogico.html" target="_parent">Psicopedagogico</a></li>
     <li><a href="objetivos.html" target="_parent">Objeticos Curriculares</a></li>
     </ul></li>
   
      <li><span class="divider divider-vert" ></span></li>
      <li><a href="secundaria.html" target="_parent" class="item-primary">Secundaria</a>
   
         <ul style="width:150px;">
         <li><a href="#">Noticias</a></li>
         <li><a href="#">Personal</a></li>
         <li><a href="#">Horarios</a></li>
         <li><a href="#">Calificaciones</a></li>
         <li><a href="#">Plan de Estudio</a></li>
         </ul></li>
   
      <li><span class="divider divider-vert" ></span></li>
      <li><a href="preparatoria.html" target="_parent" class="item-primary">Preparatoria</a>
   
         <ul style="width:150px;">
         <li><a href="#">Noticias</a></li>
       <li><a href="librovisitas/libvisitas.html" target="_parent">Libro de visitas</a></li>
         <li><a href="#">Personal</a></li>
         <li><a href="#">Horarios</a></li>
         <li><a href="#">Calificaciones</a></li>
         <li><a href="prepplan.html" target="_parent">Plan de Estudio</a></li>
         </ul></li>
     
     <li><span class="divider divider-vert" ></span></li>
      <li><a href="calendario.html" target="_parent" class="item-primary">Calendario</a>      </li>
     
     <li><span class="divider divider-vert" ></span></li>
      <li><a class="item-primary" href="#;">Chat</a>      </li>
     
     <li><span class="divider divider-vert" ></span></li>
      <li><a href="contacto.html" target="_parent" class="item-primary">Contacto</a>      </li>
   <li class="clear">&nbsp;</li></ul>
</div> 

Se me olvido

Código :

@charset "utf-8";
/* CSS Document */

body{
padding: 25px;
}

/*^'^ Navigation Structure ^'^*/
.nav-container-outer{
background: #990000;
padding: 0px;
height: 74px;
background: url(images/nav-bg.jpg);
}
.float-left{
float: left;
}
.float-right{
float: right;
}
.nav-container .divider{
display:block;
font-size:1px;
border-width:0px;
border-style:solid;
}
.nav-container .divider-vert{
float:left;
width:0px;
display: none;
}
.nav-container .item-secondary-title{
display:block;
cursor:default;
white-space:nowrap;
}
.clear{
font-size:1px;
height:0px;
width:0px;
clear:left;
line-height:0px;
display:block;
float:none;
}
.nav-container{
position:relative;
zoom:1;
margin: 0 auto;
}
.nav-container a, .nav-container li{
float:left;
display:block;
white-space:nowrap;
}
.nav-container div a, .nav-container ul a, .nav-container ul li{
float:none;
}
.nav-container ul{
left:-10000px;
position:absolute;
}
.nav-container, .nav-container ul{
list-style:none;
padding:0px;
margin:0px;
}
.nav-container li a{
float:none
}
.nav-container li{
position:relative;
}
.nav-container ul{
z-index:10;
}
.nav-container ul ul{
z-index:20;
}
.nav-container ul ul ul{
z-index:30;
}
.nav-container ul ul ul ul{
z-index:40;
}
.nav-container ul ul ul ul ul{
z-index:50;
}
li:hover>ul{
left:auto;
}
#nav-container ul {
top:100%;
}
#nav-container ul li:hover>ul{
top:0px;
left:100%;
}

/*^'^ Primary Items ^'^*/   
#nav-container a{   
padding:7px 17px 7px 18px;
margin: 10px 0px 0px 0px;
color: #FFFFFF;
font-family: Trebuchet MS, Arial, sans-serif, Helvetica;
font-size:14px;
text-decoration:none;
font-weight: bold;
background: url(images/item-primary-bg.gif);
background-repeat: no-repeat;
background-position: top;
}

#nav-container a:hover{
color: #6C3600;
background: url(images/item-primary-bg.gif);
background-repeat: no-repeat;
background-position: center;
}

/*^'^ Secondary Items Container ^'^*/   
#nav-container div, #nav-container ul{   
padding:10px 4px 10px 4px;
margin:0px 0px 0px 0px;
background: url(images/item-secondary-container-bg.jpg);
background-repeat: repeat-x;
background-color: #0000FF;
border-bottom: 1px solid #0000FF;
}

/*^'^ Secondary Items ^'^*/   
#nav-container div a, #nav-container ul a{   
padding:3px 10px 3px 6px;
background-color: #FFFFFF;
background: url(images/item-secondary-bg.jpg);
background-repeat: no-repeat;
background-position: 0px 22px;
font-size:11px;
border-width:0px;
border-style:none;
margin: 0px 0px 0px 0px;
width: 149px;
}

/*^'^ Secondary Items Hover State ^'^*/   
#nav-container div a:hover, #nav-container ul a:hover{   
background-color: #FFFFFF;
background: url(images/item-secondary-bg.jpg);
background-repeat: no-repeat;
color:#0000FF;
}

/*^'^ Secondary Item Titles ^'^*/   
#nav-container .item-secondary-title{   
cursor:default;
padding:4px 0px 3px 7px;
color: #0000FF;
font-family: Arial, Trebuchet MS, Arial, sans-serif, Helvetica;
font-size:11px;
/* background: url(images/item-secondary-title-bg.jpg); */
background-repeat: no-repeat;
font-weight:bold;
}

/*^'^ Horizontal Dividers ^'^*/   
#nav-container .divider-horiz{   
border-top-width:1px;
margin:5px 5px;
border-color: #0000FF;
}

/*^'^ Vertical Dividers ^'^*/   
#nav-container .divider-vert{   
border-left-width:1px;
height:15px;
margin:4px 2px 0px 2px;
border-color:#AAAAAA;