******* Legal Advice Needed ASAP ********

Just as an aside since this is website(s) were talking about.

If the agreement you get from him is to pay you $700 for 6 pages, don't give him the HTML/CSS/images source if at all possible. You can create 6 pages which are simply base HTML with an image which is a screenshot of the pages you made -- assuming they all fit on one screen (not a long legal document that scrolls). That way he can't take the "code" behind your pages and simply create 10-15 other pages that do what he wanted to do anyway just by editing the pages or getting someone to edit the HTML/css/etc behind the scenes.

If that's not possible, take the $700 for 6 pages but make sure the 6 pages you give are the least important ones for the site.