Forms and AHAH

Hello all,

I am very new to drupal, so don't be to hard on me if there is some stupid mistake in my code... ;)

Here is the scenario, i am developing my own module for user registration, so far so good
i managed to create a block with a form and make some validations of the fields when i click
the submit button.

Now what i want spice things up by adding some AHAH effects. My goal is that when the user clicks
on the register (submit) button, the form will fade out, a throbber will show up while the registration
process happen in the background, and when its done, a message will show up with something like
"registration done, bla bla bla".

my module is called "dctv_user_registration", here are the functions i created:

 function dctv_user_registration_menu(){
 
	$items['dctv_user_registration/js'] = array(
		'page callback' => 'dctv_user_registration_js',
		'access arguments' => array('access content'),       //not sure what to use here...
		'type' => MENU_CALLBACK
	);
	
	return $items;
 }

 function dctv_user_registration_js(){
 
	return drupal_json(array(
		'status' => TRUE,
		'data' => "YP YP YO"
	));
 }

function dctv_user_registration_form() {
	
	//define first name
	$form['dctv_user_registration_first_name'] = array(
		'#type' => 'textfield',
		'#title' => t('First name'),
		'#required' => TRUE
	);
	
	//...
       //rest of the fields...
       //...
	
	//define the submit function.
	$form['dctv_user_registration_submit'] = array(
		'#type' => 'submit',
		'#value' => t('Register'),
		'#weight' => 10,
		'#submit' => array('dctv_user_registration_form_submit'),
		'#ahaha' => array(
			'event' => 'click',
			'path' => 'dctv_user_registration/js',
			'wrapper' => 'block-dctv-user-registration',
			'method' => 'replace',
			'effect' => 'fade',
			'progress' => array(
				'type' => 'bar',
				'message' => t('Please wait...')
			)
		)
	);
	
	return $form;
}

For testing purpose my validate and submit functions are empty so no point in listing them here...

Now the problem is, when i click the submit button, nothing happens, except that the form gets submitted
and the validate and submit functions are called.

What am i doing wrong? Should i be using a different approach?

Thanks in advance!