Hello all, this is my site: http://ankursinha.net/TestSite/

I want to know for the search for above, do I code and make a search engine myself or are there any google powered search engine too?

What I mean is, I use google to search only within my site, with my existing site theme, the results come up in the body of the container. Is there anyway I can do that? Which would be a better way out? Using google or custom?