[Mediawiki-l] search box problem

[June Kim]

I have created a MediaWiki site and it really looks good, but
the search button doesn't seem to work: it only works for a very
small set of words, and that quite erratically.

Do I need to set up something, for example, run an index building
script everyday? Or is it that I don't have to do anything normally
but something must have been messed up, for example, by me editing
the sidebar template?

I'm using MediaWiki 1.3.0, PHP 4.3.8, MySQL 3.23.58.
Thanks.

-June