Untitled

Conditional Tags for Custom Taxonomy in Custom Post Type
<?php if (has_custax('a-custax')) {
    echo 'do something A';
} else {
    echo 'do something B';
}

<?php function has_custax( $custax, $_post = null ) {
    if ( empty( $custax ) )
        return false;
    if ( $_post )
        $_post = get_post( $_post );
    else
        $_post =& $GLOBALS['post'];
    if ( !$_post )
        return false;
    $r = is_object_in_term( $_post->ID, 'custax', $custax );
    if ( is_wp_error( $r ) )
        return false;
    return $r;
}
?>

<?php if ( has_custax( 'a-custax', $post->ID ) ) {
      echo 'do something A';
} else { echo 'do something B'; }; ?>