+ /***
+ * return the previous to be shown slide show image
+ *
+ * this function returns the URL of the previous image
+ * in the slideshow sequence.
+ */
+ public function getPrevSlideShowImage()
+ {
+ $all_photos = $this->getPhotoSelection();
+
+ if(!isset($_SESSION['slideshow_img']) || $_SESSION['slideshow_img'] == 0)
+ $_SESSION['slideshow_img'] = 0;
+ else
+ $_SESSION['slideshow_img']--;
+
+ $server_name = $_SERVER['SERVER_NAME'];
+ if(!isset($_SERVER['HTTPS'])) $protocol = "http";
+ else $protocol = "https";
+
+ return $protocol ."://". $server_name . $this->cfg->web_path ."phpfspot_img.php?idx=". $all_photos[$_SESSION['slideshow_img']] ."&width=". $this->cfg->photo_width;
+
+ } // getPrevSlideShowImage()
+