Hidden Dropdown Menu showing up in IE 9 all the time, breaks layout

I’m having a problem with a responsive menu on IE 9. At the small browser size in IE 9, it works as it should, converting to a dropdown, so it seems the jquery function is working properly. At the desktop browser size in IE 9, the hidden part of the menu, which should appear when hovering over it, always displays, which breaks the page layout. I’ve attached screen shots of the correct menu display (in all browsers except IE) and the IE9 display(broken).
I’ve included the jquery script, the relevant css, and the page source. The site is built in Drupal 7, using the Omega theme as a base. I would appreciate any help. This has me stumped! The website is at http://dev.cci.utk.edu

The jquery script is

 
// DOM ready
	 $(function() {
	   
      // Create the dropdown base
      $("<select />").appendTo("section.tools");
      
      // Create default option "Go to..."
      $("<option />", {
         "selected": "selected",
         "value"   : "",
         "text"    : "University Tools..."
      }).appendTo("section.tools select");
      
      // Populate dropdown with menu items
      $("ul#toolbox a").each(function() {
       var el = $(this);
       $("<option />", {
           "value"   : el.attr("href"),
           "text"    : el.text()
       }).appendTo("section.tools select");
      });
      
	   // To make dropdown actually work
	   // To make more unobtrusive: http://css-tricks.com/4064-unobtrusive-page-changer/
      $("section.tools select").change(function() {
        window.location = $(this).find("option:selected").val();
      });
	 
	 });

The CSS that applies to this menu is:


ul#toolbox {
    position: relative;
}
nav ul#nav1, nav ul#audience-nav, div.subnav, div.subnavtab, ul#toolbox {
    display: block;
}
nav ul#nav1, nav ul#audience-nav, ul#toolbox {
    display: none;
}
ul#toolbox {
    background: url("../images/bg-toolbox.png") repeat-x scroll center bottom #1A1A1A;
    border: 0 none;
    border-bottom-left-radius: 8px;
    border-bottom-right-radius: 8px;
    float: right;
    font-family: Arial,Helvetica,sans-serif;
    font-size: 0.68em;
    font-weight: bold;
    list-style: none outside none;
    margin: 0;
    outline: 0 none;
    padding: 0;
    position: fixed;
    text-transform: uppercase;
    top: 0;
    vertical-align: baseline;
    width: 100%;
    z-index: 597;
}
ul#toolbox li {
    border-right: 1px solid #4C4D4F;
    display: inline;
    float: left;
    line-height: 1.3em;
    margin: 0;
    text-align: center;
    vertical-align: middle;
}
ul#toolbox ul li {
    border-right: 0 solid #4C4D4F;
}
ul#toolbox ul li {
    display: block;
    padding: 0;
    width: 100%;
}

ul#toolbox ul li a {
    display: block;
    width: 100%;
}
ul#toolbox li a {
    color: #CCCCCC;
    display: block;
    padding: 5px 0;
    width: 100%;
}
ul#toolbox ul {
    background: url("../images/bg-drop.jpg") no-repeat scroll 50% top #333333;
    float: left;
    font-size: 90%;
    left: -50%;
    padding: 12px 0 0;
    position: absolute;
    text-align: center;
    top: 85%;
    visibility: hidden;
    width: 150px;
    z-index: 99999;
}
li {
    line-height: 18px;
    margin-bottom: 12px;
}
a, p, ul, ol, li, img, span, strong, em {
    border: 0 none;
    font: ;
    margin: 0;
    outline: 0 none;
    padding: 0;
    vertical-align: baseline;
}
a, a:visited {
  outline: 0 none;
}
a, a:visited {
  outline: 0 none;
}
ul ul li, ul ol li, ol ol li, ol ul li {
    margin-bottom: 6px;
}
li {
    line-height: 18px;
    margin-bottom: 12px;
}
li.n1 {
    margin-left: 1.6194%;
    width: 18.421%;
}
li.n2 {
    width: 8.2995%;
	}
li.n3 {
    width: 7.2874%;
}
li.n4 {
    width: 22.0647%;
}
li.n5 {
    width: 12.3481%;
}
li.n6 {
    width: 10.5263%;
}
ul#toolbox li.n7 {
    border-right: medium none;
    width: 17.2064%;
}

The page source for through the header sections is this:


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<link rel="shortcut icon" href="http://dev.cci.utk.edu/favicon.ico" type="image/vnd.microsoft.icon" />
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						<li><a href="http://chancellor.utk.edu/staff/">VICE CHANCELLORS</a></li>
						<li><a href="http://provost.utk.edu/staff/deans.shtml">ACADEMIC DEANS</a></li>
					</ul>
				</li>
				<li class="n5"><a href="https://oit.utk.edu/accounts/email/Pages/">E-mail</a>
				  <ul>
						<li><a href="https://tmail.utk.edu/">TMAIL</a></li>
						<li><a href="http://outlook.com/">VOLMAIL</a></li>
						<li><a href="http://listserv.utk.edu/">LISTSERV</a></li>
						<li><a href="https://oit.utk.edu/accounts/email/Pages/">ABOUT</a></li>
			      </ul>
				</li>
				<li class="n6"><a href="https://oit.utk.edu/">Logins</a>
				  <ul>
						<li><a href="http://myutk.utk.edu/">MYUTK</a></li>
						<li><a href="http://online.utk.edu/">ONLINE@UT</a></li>
						<li><a href="http://iris.tennessee.edu/">IRIS</a></li>
						<li><a href="https://oit.utk.edu/accounts/unix-volspace/Pages/default.aspx">WEB ACCOUNTS</a></li>
						<li><a href="https://oit.utk.edu/accounts/passwords/Pages/default.aspx">PASSWORDS</a></li>
						<li><a href="/user/login/">CCI Website Login</a></li>
			      </ul>
				</li>
				<li class="n7"><a href="http://www.lib.utk.edu/">Libraries</a>
				  <ul>
						<li><a href="http://www.lib.utk.edu/">UNIVERSITY LIBRARIES</a></li>
						<li><a href="http://www.lib.utk.edu/agvet/">AGRICULTURE &amp; VET MED</a></li>
						<li><a href="http://www.law.utk.edu/library/">LAW</a></li>
						<li><a href="http://gsm.utmck.edu/library/">MEDICAL</a></li>
						<li><a href="http://www.lib.utk.edu/music/">MUSIC</a></li>
						<li><a href="http://www.lib.utk.edu/swn/">SOCIAL WORK</a></li>
						<li><a href="http://www.utsi.edu/library/">SPACE INSTITUTE</a></li>
						<li><a href="http://www.lib.utk.edu/spcoll/">SPECIAL COLLECTIONS</a></li>
			      </ul>
				</li>
			</ul>
			<div class="search">
            <form id="utk_seek" name="utk_seek" method="post" accept-charset="iso-8859-1"  action="http://www.utk.edu/masthead/query.php" speech x-webkit-speech>
						<input type="text" name="qt"   class="searchfield" title="search" />
						<input type="hidden" name="qtype" class="searchtext" value="utk" title="search type" /> 
						<input name="go" type="submit" title="Submit" class="searchbutton" value="Search">
			 </form>	
             </div>
             <div>
            <select><option selected="selected" value="">University Tools...</option><option value="http://registrar.tennessee.edu/academic_calendar/">Calendars</option><option value="http://www.utk.edu/events/">EVENT CALENDAR</option><option value="http://registrar.tennessee.edu/academic_calendar/">ACADEMIC CALENDAR</option><option value="http://registrar.tennessee.edu/academic_calendar/">ACADEMIC TIMETABLE</option><option value="http://registrar.tennessee.edu/academic_calendar/">KEY DATES</option>
            <option value="/calendar/">CCI CALENDAR</option><option value="scl/calendar/">SCRIPPS LAB CALENDAR</option>
            <option value="http://www.utk.edu/maps/">Maps</option><option value="http://www.utk.edu/maps/">Interactive </option><option value="http://www.utk.edu/maps2/archive/">Archive</option><option value="http://utk.edu/alpha/">A-Z</option><option value="http://utk.edu/alpha/#A-E">A-E</option><option value="http://utk.edu/alpha/#F-J">F-J</option><option value="http://utk.edu/alpha/#K-O">K-O</option><option value="http://utk.edu/alpha/#P-T">P-T</option><option value="http://utk.edu/alpha/#U-Z">U-Z</option><option value="http://directory.utk.edu/">People Finder</option><option value="http://directory.utk.edu/">CAMPUS DIRECTORY</option><option value="http://chancellor.utk.edu/">CHANCELLOR</option><option value="http://provost.utk.edu/">PROVOST</option><option value="http://chancellor.utk.edu/staff/">VICE CHANCELLORS</option><option value="http://provost.utk.edu/staff/deans.shtml">ACADEMIC DEANS</option><option value="https://oit.utk.edu/accounts/email/Pages/">E-mail</option><option value="https://tmail.utk.edu/">TMAIL</option><option value="http://outlook.com/">VOLMAIL</option><option value="http://listserv.utk.edu/">LISTSERV</option><option value="https://oit.utk.edu/accounts/email/Pages/">ABOUT</option><option value="https://oit.utk.edu/">Logins</option><option value="http://myutk.utk.edu/">MYUTK</option><option value="http://online.utk.edu/">ONLINE@UT</option><option value="http://iris.tennessee.edu/">IRIS</option><option value="https://oit.utk.edu/accounts/unix-volspace/Pages/default.aspx">WEB ACCOUNTS</option><option value="https://oit.utk.edu/accounts/passwords/Pages/default.aspx">PASSWORDS</option>
            <option value="/user/login">CCI Website Login</option><option value="http://www.lib.utk.edu/">Libraries</option><option value="http://www.lib.utk.edu/">UNIVERSITY LIBRARIES</option><option value="http://www.lib.utk.edu/agvet/">AGRICULTURE &amp; VET MED</option><option value="http://www.law.utk.edu/library/">LAW</option><option value="http://gsm.utmck.edu/library/">MEDICAL</option><option value="http://www.lib.utk.edu/music/">MUSIC</option><option value="http://www.lib.utk.edu/swn/">SOCIAL WORK</option><option value="http://www.utsi.edu/library/">SPACE INSTITUTE</option><option value="http://www.lib.utk.edu/spcoll/">SPECIAL COLLECTIONS</option></select>	
			</div>
		</section>
	</div>
</header>

Hi,

Try fixing the list first and see if that makes a difference.


<li class="n1"> <a href="http://registrar.tennessee.edu/academic_calendar/">Calendars</a>
		<ul>
				<li><a href="http://www.utk.edu/events/events/">EVENT CALENDAR</a></li>
				<li><a href="http://registrar.tennessee.edu/academic_calendar/">ACADEMIC CALENDAR</a></li>
				<li><a href="http://registrar.tennessee.edu/academic_calendar/">ACADEMIC TIMETABLE</a></li>
				<li><a href="http://registrar.tennessee.edu/academic_calendar/">KEY DATES</a></li>
				<li><a href="/calendar/">CCI CALENDAR</a></li>
				<li><a href="scl/calendar/">SCRIPPS LAB CALENDAR</a></li>
		</ul>
</li>


You missed the opening list tag in the last list item shown above.

There’s also a lot of errors on that page and some weird doctype and two html tags.

Thank you!! That fixed it!! I will look at the CSS Validator and fix the errors. So simple yet so hard to find when you’ve been staring at it for days!!
Thank you also for your quick reply - very very much appreciated.