I bought a Drupal 7 premium theme and thus my menus use the theme's default menu class.
How do I remove this class from one of the menus so that it would be a simple HTML list or use the native Drupal menu class?
You can remove all unwanted classes and add your own classes using the code below, Its for a rough idea, use dpm or any debugger to locate exact tool
function THEME_menu_link(array $variables) {
//unset all the classes
unset($variables['element']['#attributes']['class']);
$element = $variables['element'];
if($variables['element']['#attributes'])
$sub_menu = '';
if ($element['#below']) {
$sub_menu = drupal_render($element['#below']);
}
$output = l($element['#title'], $element['#href'], $element['#localized_options']);
return '<li' . drupal_attributes($element['#attributes']) . '>' . $output . $sub_menu . "</li>\n";
}