Slapping together a Search Engine

[Anon]

I think I have it all down, just not sure how to do this line of code

NOT SURE ABOUT THIS PARAGRAPH
FIRST I format each searchterms passed into the script as 'word1','word2','word3' and stick it in a string called $querywords.

Then I throw them into this SQL query:

I UNDERSTAND THIS
SELECT count(search_table.word) as score, search_table.qid,your_table.blob
FROM search_table,your_table
WHERE your_table.qid = search_table.qid AND search_table.word
IN($querywords)
GROUP BY search_table.qid
ORDER BY score DESC";

Any Takers -- Thanks