For example are you looking to search the web, your own website or another site(s)? I can possibly help in any of these cases.
Take a look at the search facility at the top of the page here. I wrote this script to let users search many different sites (Goog, Y, Blogs, eBay etc. etc.) using a keyword(s) of their choice. It can either be coded in to a page or you may find it more convenient to place it on a dedicated page and Iframe in to other pages wherever you want. The example I've shown you is Iframed in to place and rsults appear in a new window.
Be pleased to help as a favour if I can and it's not going to be too heavy on time.
Whoops! Should have mentioned that the eBay searches in the example shown in the previous post are linked to my eBay affiliate account. Don't want to take advantage of anyone testing the script!