92
Try it like this:
if ( !empty($HTTP_POST_VARS['interest']) ) {
$criteria = new CriteriaCompo(new Criteria('interest1', '%'.$myts->addSlashes(trim($HTTP_POST_VARS['interest'])).'%', 'LIKE'));
$criteria->add(new Criteria('interest2', '%'.$myts->addSlashes(trim($HTTP_POST_VARS['interest'])).'%', 'LIKE'), 'OR');
}