Widgets Disappear from Sidebar

I am working on a theme from scratch and I just implemented a widgetized sidebar, but whenever I try to add a widget to the sidebar, it disappears when I come back to the page.

Below is my code:

functions.php:

<?php
$sidebar = array(
'name'          => 'Sidebar',
'id'            => 'sidebar-$i',
'before_widget' => '<li id=\"%1$s\" class=\"widget %2$s\">',
'after_widget'  => '',
'before_title'  => '<h2 class=\"widgettitle\">',
'after_title'   => '</h2>'
);

if(function_exists('register_sidebar')){
   register_sidebar($sidebar);
}
?>

sidebar.php:

<div id="pagesidebar">
   <ul id="sidebar">
      <?php if(!function_exists('dynamic_sidebar') || !dynamic_sidebar() ) : ?>

<li>{static sidebar item 1}</li>
<li>{static sidebar item 2}</li>
      <?php endif; ?>

</div>

I am pretty sure I am doing something wrong, since widgets stay in Kubrick.