Instead of nesting your if
statements, use the or operator:
if($category=='copyclearance' || $category=='anothercat') {
// ...
}
If you want to do more than two, I recommend using an array:
$valid_cats = array('copyclearance', 'cat2', 'cat3', 'etc');
if(in_array($category, $valid_cats)) {
// ...
}