Id of nivo slider is not unique

In the template_preprocess_views_nivo_slider_view() function an id for the nivo slider div is created:

  $vars['views_nivo_slider_id'] = 'views-nivo-slider-' . $view->name . '-' . $view->current_display;

In some cases this will not create unique id's. For example when having a view containing other views that use the nivo slider. You can achieve this by using the EVA module.

Anyway, to prevent duplicate id's, they should be created like this:

  $vars['views_nivo_slider_id'] = drupal_html_id('views-nivo-slider-' . $view->name . '-' . $view->current_display);

I've created a patch for this.