Returns HTML for a password form element.
$variables: An associative array containing:
function theme_password($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'password';
element_set_attributes($element, array(
'id',
'name',
'size',
'maxlength',
));
_form_set_class($element, array(
'form-text',
));
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}