sup.js

 // Check for hash value in URL  
    var hash = window.location.hash.substr(1);
    //Check to ensure that a link with href == hash is on the page  
    if ($('a[href="' + hash + '"]').length) {
         //Load the page.
         var toLoad = hash + '.html #main-content';
         $('#main-content').load(toLoad);
    }


    $('nav ul li a').click(function(){
        if (window.location.hash.substring(1) == $(this).attr('href')) {
            return false;
        }

    var toLoad = $(this).attr('href')+' #main-content';  
    $('#main-content').hide('fast',loadContent);  
    $('#load').remove();  
    $('#wrapper').append('<span id="load">LOADING...</span>');  
    $('#load').fadeIn('normal');  
    window.location.hash = $(this).attr('href').substr(0,$(this).attr('href').length-5);  
    function loadContent() {  
        $('#main-content').load(toLoad,'',showNewContent())  
    }  
    function showNewContent() {  
        $('#main-content').show('normal',hideLoader());  
    }  
    function hideLoader() {  
        $('#load').fadeOut('normal');  
    }  
    return false;  

    });