My first simple widget, and it doesnt work!

Hi there wordpressers

Im trying to wrap my head around widgets and how to create them. Im having moderate success ??

I’ve made a simple widget with a textarea, nothing else.
It shows up under “Available Widgets”, and I can add it to “Current Widgets” without problems. But when I hit “Save Changes” it pops back to “Available Widgets” and doesn’t show up in the widget area on the site.

I checked in the wp-options table in the database, and the text is saved like it should be.
Can anyone help me figuring out what Im doing wrong? This is the code:

<?php
if ( function_exists('register_sidebar') )
register_sidebar(array('name' => 'Sidebar',
'before_widget' => '',
'after_widget' => '',
'before_title' => '<h2>',
'after_title' => '</h2>',
));
if ( function_exists('register_sidebar') )
register_sidebar(array('name' => 'Below Content',
'before_widget' => '',
'after_widget' => '',
'before_title' => '<h2>',
'after_title' => '</h2>',
));

function myTestWidget() {

	$settings = get_option("widget_mytestwidget");
	$text = $settings['text'];?>
	<div class="widget">
    <div class="wrap">
    <h2>Test Widget</h2>
    <p><?php echo $number; ?></p>
    </div>
	</div>

<?php }

function myTestWidgetAdmin() {

	$settings = get_option("widget_mytestwidget");

	// check if anything's been sent
	if (isset($_POST['update_test'])) {
		$settings['text'] = strip_tags(stripslashes($_POST['mytest_text']));
		update_option("widget_mytestwidget",$settings);
	}

	echo '<p style="text-align: right;">
			<label for="mytest_text"> Text:
			<textarea id="mytest_text" name="mytest_text" type="text" style="width: 200px;" value="'.$settings['text'].'" /></textarea></label></p>';
	echo '<input type="hidden" id="update_test" name="update_test" value="1″ />';

}

register_sidebar_widget('My Test Widget', 'myTestWidget');
register_widget_control('My Test Widget', 'myTestWidgetAdmin', 300, 200);
?>

Oh and im doing it in the functions.php theme file, if that matters.