Search form, capital letters

Search form, capital letters

Can someone help me with this. The form needs to make no difference
between capital letters and normal letters.
$raw_results = mysql_query("SELECT * FROM product
WHERE (`naam` LIKE '%".$query."%') OR (`titel` LIKE
'%".$query."%') OR (`druk` LIKE '%".$query."%')") or
die(mysql_error());