-<input type="submit" class="button" name="save" value="<?php _e('Save Changes'); ?>" />
-<input type="hidden" name="post_id" id="post_id" value="<?php echo $post_id; ?>" />
-<input type="hidden" name="attachment_id" id="attachment_id" value="<?php echo $att_id; ?>" />
+<input type="submit" class="button-primary" name="save" value="<?php esc_attr_e('Update Media'); ?>" />
+<input type="hidden" name="post_id" id="post_id" value="<?php echo isset($post_id) ? esc_attr($post_id) : ''; ?>" />
+<input type="hidden" name="attachment_id" id="attachment_id" value="<?php echo esc_attr($att_id); ?>" />