exclude category

p.s. this is how i do it on the entry.php to filter out posts tagged with that category from being shown on the category page.

<?php
if (is_category()) {
// assign the variable as current category
$categoryvariable = $cat;

// concatenate the query
$args = 'cat=' . $categoryvariable . ',-162';

// run the query
query_posts( $args );
}
?>