Solved the problem
in the core.php file located in the lib folder i replaced the following code in line 451
if($options['logo']) // logo image?
$output .= '<a href="'.$siteurl.'"><img src="'.$options['logo'].'" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
else
$output .= '<a href="'.$siteurl.'">'.$sitename.'</a>';
$output .= '</'.$tag.'>';
echo apply_filters('mystique_logo', $output);
}
by the following code depending on the page number overrides the custom logo image uploaded in the mystique settings by the one of your choice
if ( is_page(array (6,9,106,11,117,123,125,127,13,15,17)) || $post->post_parent == '6' ) {
// the page is "6,9,106,11,etc...", or the parent of the page is "6"
$output .= '<a href="'.$siteurl.'"><img src="link to the image" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
} elseif ( is_page(array(22,24,26,28)) || $post->post_parent == '22' ) {
$output .= '<a href="'.$siteurl.'"><img src="link" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
} elseif ( is_page(array (32,34,36,38)) || $post->post_parent == '32' ) {
$output .= '<a href="'.$siteurl.'"><img src="link" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
} elseif ( is_page(array (44,46,48,50)) || $post->post_parent == '44' ) {
$output .= '<a href="'.$siteurl.'"><img src="link" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
} elseif ( is_page(array (54,56,58,60,62)) || $post->post_parent == '54' ) {
$output .= '<a href="'.$siteurl.'"><img src="link" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';;
} elseif ( is_page(array (66,68,70,72,74)) || $post->post_parent == '66' ) {
$output .= '<a href="'.$siteurl.'"><img src="link" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
} elseif ( is_page(array (79,81,83)) || $post->post_parent == '79' ) {
$output .= '<a href="'.$siteurl.'"><img src="link" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
} elseif ($options['logo']) // logo image?
$output .= '<a href="'.$siteurl.'"><img src="'.$options['logo'].'" title="'.$sitename.'" '.$size.' alt="'.$sitename.'" /></a>';
else
$output .= '<a href="'.$siteurl.'">'.$sitename.'</a>';
$output .= '</'.$tag.'>';
echo apply_filters('mystique_logo', $output);
}
the last part trows back the default image uploaded if none of the pages match.
Hope this helps someone