div tags around the form elements

here are my theming functions:

function add_form_form($form, &$form_state) {
	
    $form['call[]'] = array(
		'#type' => 'textfield',
	);
	$form['rst1[]'] = array(
		'#type' => 'textfield',
		'#maxlength' => 4,
	);
	$form['note1[]'] = array(
		'#type' => 'textfield',
	);
	$form['uct[]'] = array(
		'#type' => 'textfield',
	);
	$form['qso[]'] = array(
		'#type' => 'textfield',
	);
	$form['rst2[]'] = array(
		'#type' => 'textfield',
		'#maxlength' => 4,
	);
	$form['note2[]'] = array(
		'#type' => 'textfield',
	);
	
	$form['submit'] = array(
		'#type' => 'submit',
		'#value' => 'Submit',
	);
	
	$path = drupal_get_path('module', 'add_form');	
	$form['#attached'] = array(
		'css' => array(
			'type' => 'file',
			'data' => $path . '/css/add_form.css',
		),
		'js' => array(
			'type' => 'file',
			'data' => $path . '/js/add_form.js',
		),
	);
	
	return $form;
}

function add_form_theme(){
	return array(
		'add_form_form' => array('render element' => 'form'),
	);
}

function add_form_form_field($variables) {
	foreach($variables['items'] as $delta => $item) {
		$output .= drupal_render($item);
	}
	return $output;
}

function theme_add_form_form($variables) {
	$form = $variables['form'];
	$output = '<div id="log_form_wrap">';
	$output .= '<div id="log_call">';
	$output .= '	<div class="call">';
	$output .= '		<span>'.t('CALL').'</span>';
	$output .= drupal_render($form['call[]']);
	$output .= '	</div>';
	$output .= '	<div class="rst1">';
	$output .= '		<span>'.t('RST').'</span>';
	$output .= drupal_render($form['rst1[]']);
	$output .= '	</div>';
	$output .= '	<div class="note1">';
	$output .= '		<span>'.t('NOTE').'</span>';
	$output .= drupal_render($form['note1[]']);
	$output .= '	</div>';
	$output .= '</div>';
	$output .= '<div class="uct">';
	$output .= '	<span>'.t('UCT').'</span>';
	$output .= drupal_render($form['uct[]']);
	$output .= '</div>';
	$output .= '<div id="log_qso">';
	$output .= '<div class="qso">';
	$output .= '<span>'.t('QSO').'</span>';
	$output .= drupal_render($form['qso[]']);
	$output .= '</div>';
	$output .= '<div class="rst2">';
	$output .= '<span>'.t('RST').'</span>';
	$output .= drupal_render($form['rst2[]']);
	$output .= '</div>';
	$output .= '<div class="note2">';
	$output .= '<span>'.t('NOTE').'</span>';
	$output .= drupal_render($form['note2[]']);
	$output .= '</div>';
	$output .= '</div>';
	$output .= '</div>';
	
	$output .= drupal_render_children($form);
	
	return $output;
	
}

The form is themed but every field has div wraps, how to remove them completely?