Alternatively you can use a program by 'coffee cup' I think it's called 'search'. google their website and you'll see which app it is, they do a few apps for web related things.
Your server will need PHP to run its scripts it generates, but basically you load up the html pages from your site into the application and it stores all the words in them to a file. It then generates the html code for your search button. You can tweak with layout and options.
Then you just upload its generated files to your site along with your adjusted html page that has the search code now pasted in.
good luck.