http://www.google.com/coop/cse/ is the first link one should visit. But I am not sure if it is the easiest way to go. I thought all I had to do is copy paste some code lines, in php, in web pages of my site. Instead of this, if I try to explore google custom search through the official google page, I should make a google account, make some declaration etc. Can you please help me to do it with ease? Are there any php code lines to include them in my site?