My accordion menu isn't working

Hi, I'm trying to make my left vertical menu(http://www.labctsi.org/index.php/cct/community_advisory_committee/) , under committee, to be like the accordion menu here:
http://roshanbh.com.np/2008/06/accordion-menu-using-jquery.html
Attached is my code for this.  However, I'm not sure where to put the left and down .png files for this to work?      
The CSS file is copy from the site above. Below is one of the CSS code regardnig the image.
background: #eef4d3 url(left.png) center right no-repeat;
Nothing happens now when I position cursor over the "Center Advisory".  I wonder if it's becuase it can't find the left and down .png files.

$(document).ready(function() {
 	        $("ul.sf-menu").supersubs({ 
                minWidth:    8,   // minimum width of sub-menus in em units 
                maxWidth:    25,   // maximum width of sub-menus in em units 
                extraWidth:  0     // extra width can ensure lines don't sometimes turn over 
                                   // due to slight rounding differences and font-family 
            }).superfish();
			
	});
	
	//slides the element with class "menu_body" when mouse is over the paragraph
	$("#committeeMenu li.menu_head").mouseover(function()
	{	$(this).css({backgroundImage:"url(down.png)"}).next("div.menu_body").slideDown(500).siblings("div.menu_body").slideUp("slow");
	   $(this).siblings().css({backgroundImage:"url(left.png)"});
	});	
 	</script>



		<div id="mainContent">
			<div id="secondaryNavigationColumn">
			    <div id="navcontainer">
			        <h2>OCE Menu</h2>
                    <ul id="navlist">
                        <li><a href="http://www.labctsi.org/index.php/cct/">Home</a></li>
                        <li><a href="http://www.labctsi.org/community">Resources/Services</a></li>
                        <li><a href="http://www.labctsi.org/index.php/cct/all_news/">News</a></li>
                        <li><a href="http://www.labctsi.org/index.php/cct/all_events/">Events</a></li>
                        <li><a href="http://www.labctsi.org/index.php/cct/about_us/">About Us</a></li>
	                    <h2>Committees</h2>
						<div id="committeeMenu" class="menu_list">
							<li class="menu_head">Center Advisory</li>
							<div class="menu_body">
								<li id="active"><a href="http://www.labctsi.org/index.php/cct/community_advisory_committee/">Advisory Committee</a></li>
							</div>
								<li><a href="http://www.labctsi.org/index.php/cct/community_health_providers/">Community Health Care Providers</a></li>
								<li><a href="http://www.labctsi.org/index.php/cct/community_leadership_council/">Community Leadership Council</a></li>
						</div>
                    </ul>
                </div>
			</div>

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