[Plugin: WP-prettyPhoto] German Locale Kills Javascript

$output = <<<EOHTML
      <script type="text/javascript" charset="utf-8">
        /* <![CDATA[ */
        jQuery(document).ready(function($) {
          $("a[rel^='{$wppp_rel}']").prettyPhoto({
            animationSpeed: '{$wppp_speed}',
            padding: {$wppp_padding},
            /*opacity: {$wppp_opacity},*/

As you see, I have to disable the opacity value because of $wppp_opacity returns “0,35” which leads to an javascript exception (object initialization error).

This happens in the german version and may have its origin in the different locale.

http://ww.wp.xz.cn/extend/plugins/wp-prettyphoto/