Thank you!
Adding that code did not work. Based on that idea, directly in the mystique_logo(); function, I replaced <a href="'.$siteurl.'"> with <a href="NEW URL"> and that worked.
Thanks, here is the function.
function mystique_logo(){
$options = get_option('mystique');
$size = $options['logo_size'];
if($size) $size = 'width="'.substr($size, 0, strpos($size, "x")).'" height="'.substr($size, strpos($size, 'x')+1).'"';
$sitename = get_bloginfo('name');
$siteurl = get_bloginfo('url');
$tag = (is_home() || is_front_page()) ? 'h1' : 'div';
$output = '<'.$tag.' id="logo">';
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);
}
