JavaScript - Como puedo hacer funcionar esto?

$(document).ready(function() {

// load all links in a new window
$('p a').each(function(){
$(this).attr('target','_blank');
});

// the currently loaded section
var curLoaded = 'about';

// start by showing the about us section
$('#contentContainer').animate({
height: 350
},"slow", function(){
// fade in the content
$('#' + curLoaded).fadeIn();
});

// navigation trigger
$('#navbar a').each(function() {
var $this = $(this)
var target = $this.attr('href').split('#')[1];
var $contentContainer = $('#contentContainer');
var oldPos = 60;
var newPos = 350;

// add a click handler to each A tag
$this.click(function(){
// if the container isn't open, then open it...duh!
if ($contentContainer.css('height') == '60px') {
// trigger the animation
$contentContainer.animate({
height: newPos
},"slow", function(){
// fade in the content
$('#' + target).fadeIn();
});
} else {
if (curLoaded == target) {
$contentContainer.animate({
height: oldPos
},"slow", function(){
$('#content div').hide();
});
} else {
$contentContainer.animate({
height: oldPos
},"slow", function(){
$('#content div').hide();
$contentContainer.animate({
height: newPos
},"slow", function(){
$('#' + target).fadeIn();
});
});
}
}

curLoaded = target;

return false;
});

});

// remove the focus lines
$('a').focus( function() { $(this).blur(); } );

});