PLZ HELP: Menu works fine with Firefox- Collapse in IE

I just finished making a menu(with dropdown submenu) for my blog.

It works great with firefox, but collapse in IE

I think it needs some change in CSS… I don’t understand how to configure it for IE.

Here is a Dummy of my menu. I would be grateful if anyone helps me out there.

Here is a live demo of my menu…( Meant to configure first before finally use in my blog)

Here is the CODE

<SCRIPT TYPE="text/javascript">
sfHover = function() {
	var sfEls = document.getElementById("mymenu").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

</SCRIPT>
<style type="text/css">
	
#mymenucontainer {
	height:34px;
	display:block;
	padding:0px 0 0px 0px;
	font: 12px Georgia,Century gothic,verdana, Arial, sans-serif;
	font-weight:normal;
	text-transform:uppercase;
	background-image: url(Maintain/Menu.jpg);
	background-repeat: repeat-x;
	}
		
#mymenu {
	margin: 0px 0px 0px 0px;
	padding: 0px 15px;
	list-style: none;
	height:34px;
	}

#mymenu ul {
	margin: 0px 0px 0px 0px;
	padding: 0px 0px;
	list-style: none;
	height:34px;
	}

#mymenu a {
	color: #444;
	display: block;
    font-weight: normal;
  	padding: 10px 5px 9px 5px;
	}
	
#mymenu a:hover {
	color: #D40404;
	display: block;
	text-decoration: none;
	}

#mymenu li {
	float: left;
	margin: 0px 0px;
	padding: 0px 0px 0px 5px;
	}
	
#mymenu li li {
	float: left;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px;
	width: 125px;
	}
	
#mymenu li li a, #mymenu  li li a:link, #mymenu  li li a:visited {
	background:#DEDCDD ;
	width: 150px;
	float: none;
	margin: 0px 0px;
	padding: 7px 10px 7px 10px;
	color:#555;
	}
	
#mymenu li li a:hover, #mymenu  li li a:active {
	background:#fff ;
	width: 150px;
	float: none;
	margin: 0px;
	padding: 7px 10px 7px 10px;
	color:#D40404;
	}

#mymenu li ul {
	position: absolute;
	left: -999em;
	z-index:200;
	background:url(image URL);
	width:170px;
	}

#mymenu li:hover ul {
	left: auto;
	display: block;
	}
	
#mymenu li:hover ul, #mymenu li.sfhover ul {
	left: auto;
	}	
</style>
<!-- mymenucontainer -->
<DIV id='mymenucontainer'>
<DIV id='mymenu'>
  <UL>
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A>
      <UL class='submenuitem'>
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
      </UL>
    </LI>
	
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A>
      <UL class='submenuitem'>
	    <LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	    <LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	    <LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	  </UL>
    </LI>
	
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A>
      <UL class='submenuitem'>
	    <LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
      </UL>
    </LI>
    
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>

	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A>
      <UL class='submenuitem'>
	    <LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	    <LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
      </UL>
    </LI>
	
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	
	<LI><A href='LINK-HERE' title='TITLE-HERE'>TITLE-HERE</A></LI>
	
  </UL>
</DIV>		
</DIV>
<!-- /mymenucontainer -->

Code (markup):