Site Navigation with jQuery

We started by... Maybe you should View the Source on the Demo. If you have any questions let me know. :/
$('#topnav li a').click(function(e){
e.preventDefault();
if($("html, body").scrollTop() != 0) {
$("html, body").animate({ scrollTop: 0 }, "slow");
}
var toLoad = $(this).attr('href')+'';
$('#content').fadeOut(500,loadContent);
$('#load').remove();
$('#loader').append('LOADING...');
$('#load').fadeIn('normal');
var hash = $(this).attr('href').substr(0,$(this).attr('href').length-5);
controlAnchoring(hash);
setActiveBtn(this);
function loadContent() {
$('#content').load(toLoad,'',showNewContent())
}
function showNewContent() {
$('#content').fadeIn(1000,hideLoader());
}
function hideLoader() {
$('#load').fadeOut('normal');
}
return false;
});