$(document).ready(function() {    
                           
    $('#main_nav ul li.last a').hover (function() {
        $('#main_nav').css({"background" : "url(/includes/images/external/main_nav/main_nav_bg_hover.gif) no-repeat top right"});
    }, function() {
        
        if($('#main_nav ul li.last a').hasClass('active')) {
            $('#main_nav').css({"background" : "url(/includes/images/external/main_nav/main_nav_bg_hover.gif) no-repeat top right"});
        }
        else {        
        $('#main_nav').css({"background" : "url(/includes/images/external/main_nav/main_nav_bg.gif) no-repeat top right"});
        }
        
    });
    if($('#main_nav ul li.last a').hasClass('active')) {
        $('#main_nav').css({"background" : "url(/includes/images/external/main_nav/main_nav_bg_hover.gif) no-repeat top right"});
    }
    
});