Copyright idea for a site?

Hi all,

I’ve thought of a cool idea for a web-site and have a good plan for it etc. Also bought a suitable domain name. I have had a look around the web, and as far as I can see, my idea is not being used. I am trying to learn the technology etc needed to develop the site, but may take a while as also have full time job.
The q i want to ask is, is there any way that I can copyright my idea, so if I do post some q’s for feedback etc on this site, that no one can copy my idea and get it up and running quicker than I can.

Hope you can help, Andy