Sorry i solved the problem by myself... indeed it was not a big deal...

in .../includes/function/extra_function/zx_banner.php

line 68 to 73 find and add the red character:

$banner_string = '<img src="' . DIR_WS_IMAGES . $banner->fields['banners_image'] . '" alt="'. $banner->fields['banners_title'].'" />';
} else {
if ($banner->fields['banners_open_new_windows'] == '1') {
$banner_string = '<a href="' . zen_href_link(FILENAME_REDIRECT, 'action=banner&goto=' . $banner->fields['banners_id']) . '" target="_blank">' . '<img src="' . DIR_WS_IMAGES . $banner->fields['banners_image'] . '" alt="'. $banner->fields['banners_title'].'" /></a>';
} else {
$banner_string = '<a href="' . zen_href_link(FILENAME_REDIRECT, 'action=banner&goto=' . $banner->fields['banners_id']) . '">' . '<img src="' . DIR_WS_IMAGES . $banner->fields['banners_image'] . '" alt="'. $banner->fields['banners_title'].'" /></a>';

Pay attention to the SPACE befor the "/"!!!