Add an else to the condition along with adding the excluded category id in the is_category()
call. You will also need to include/exclude that particular category depending on the condition that is true:
NOTE: you probably want to avoid using query_posts
and use WP_Query()
Reference here
<?php
if (is_category(15)) {
$posts = query_posts($query_string . '&orderby=date&order=asc&cat=15');
}
else {
if(is_category()) {
$posts = query_posts($query_string . '&orderby=title&order=asc&cat=-15');
}
}
?>
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