SELECT problem between MySQL 3.23 and MySQL 4

Hi there everyone, I'm using Booleans in my searches (New to it) but it works perfectly on my local 3.23 version of MySQL, but on the main server which uses version 4 of MySQL I get an error so there's an error in my Syntax. Here's what I currently use: SELECT id, def, word, 0.2*( LENGTH(word) - LENGTH(REPLACE(LOWER(word),LOWER('as'),''))) /LENGTH('as') + 0.2*( LENGTH(def) - LENGTH(REPLACE(LOWER(def),LOWER('as'),''))) /LENGTH('as') as relevance FROM joyzine.dictionary WHERE ( word LIKE '%as%' OR def LIKE '%as%' ) HAVING relevance>0 ORDER BY relevance DESC And here's the error I receive on the remote MySQL 4 server: Warning: Bad arguments to implode() in /var/www/html/www.planetoxygene.com/htdocs/funcs_mysql_boolean.php on line 45 You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near ') - LENGTH(REPLACE(LOWER(),LOWER('as'),''))) /LENGTH('as' Can anyone see what is wrong which is stopping it being compatible with MySQL 4? Any help would really be appreciated, as this system is very important. Best Wishes Chris