How to Preview Messages such as…

… You are looking for something that is not here?
For example, how would I preview this in my browser..?

<?php else :
if ( is_category() ) { // If this is a category archive
printf("<h2 class='center'>Sorry, but there aren't any posts in the %s category yet.</h2>", single_cat_title('',false));
} else if ( is_date() ) { // If this is a date archive
echo("<h2>Sorry, but there aren't any posts with this date.</h2>");
} else if ( is_author() ) { // If this is a category archive
$userdata = get_userdatabylogin(get_query_var('author_name'));
printf("<h2 class='center'>Sorry, but there aren't any posts by %s yet.</h2>", $userdata->display_name);
} else {
echo("<h2 class='center'>No posts found.</h2>");
}
get_search_form();
endif;
?>

Cheers,
Mark