- (void)changeDefaultView:(NSNotification *)note
{
    [self closePopover];

    int i;
    for(i = 0; i < [arrWebViewControllers count]; i++)
    {
        WebViewController *wvc = [arrWebViewControllers objectAtIndex:i];
        [[wvc webview] stopLoading];
        [[wvc webview] removeFromSuperview];
        [[wvc imageview] removeFromSuperview];
        wvc = nil;
    }

    [arrWebViewControllers removeAllObjects];
    [arrLinks removeAllObjects];
    [arrImageViews removeAllObjects];

    [self loadCategory:[note object]];

    [self addWidgetsToView];
}

- (void)closePopover
{
    if(popover != nil)
    {
        [popover dismissPopoverAnimated:YES];
        popover = nil;
    }
}

- (void)changeDefaultView:(NSNotification *)note
{
    [self closePopover];

    int i;
    for(i = 0; i < [arrWebViewControllers count]; i++)
    {
        WebViewController *wvc = [arrWebViewControllers objectAtIndex:i];
        [[wvc webview] stopLoading];
        [[wvc webview] removeFromSuperview];
        [[wvc imageview] removeFromSuperview];
        wvc = nil;
    }

    [arrWebViewControllers removeAllObjects];
    [arrLinks removeAllObjects];
    [arrImageViews removeAllObjects];

    // perform the expensive operation on a background thread
    dispatch_async(dispatch_get_global_queue(0, 0), ^{

        [self loadCategory:[note object]];

        // now get back onto the main thread to perform our UI update
        dispatch_async(dispatch_get_main_queue(), ^{

            [self addWidgetsToView];

        });

    });
}