$(document).ready(function () {    
    
    $("ul#topnav li").hover(function() { //Hover over event on list item
        $(this).css({}); //Add background color and image on hovered list item
        $(this).find("span").show(); //Show the subnav
    } , function() { //on hover out...
        $(this).css({ 'background' : 'none'}); //Ditch the background
        $(this).find("span").hide(); //Hide the subnav
    });
    
});