Simple php script for my site

I have a Hungarian based language site: http://www.fajltube.com with articles on different categories.

I want to implement a simple php search engine for my website on pages like this on the top left corner:
http://www.fajltube.com/gazdasag/jogszabalyok/index.php
and on individual pages with photos like this one:
http://www.fajltube.com/gyogyszer/Az-erdei-gyumolcsok-genmegorze53732.php
i need to be able to make a difference between articles with photos or not image article.

Note: I keep all texts (title, body articles) on a mysql database.

I need some code suggestions, to make this script run fast.

Thanks all - for your time to reply..