Today i found this webbsite with their own search engine. But I can't understand how to make one for my site like this. can any one tell me? see the screen shot below. I can give link if you need. Thanks in advance.
It depends who you are looking to use as the search provider. For instance, you can publish your own branded search which utilizes Google. This may be easier than working on your own search engine scripts and such. See Google Custom Search pages for more information. (http://www.google.com/cse/)