Pat,
To add to Andy's comments: Copyright and warranties are a big part of it. There are two ways that sites can form contracts with others, by "clickwrap" - the "I accept" button, otherwise you don't get in. And secondly by "browsewrap", which for many sites is a little button at the bottom (usually on the home page) called a "Terms of Use Agreement", or a "Legal Disclosure", "Terms and Conditions" (whatever you want to call it) which along with the copyright and warranty stuff gives the rules for using your site. You might see things like authorized use, e-mail use, governing jurisdiction, etc. Ideally, this spells out how you want your site to work. Is this a necessary part of every site? No, but if you have such a contract on your site it should not be in conflict with other portions of your site. Also, while "clickwrap" is almost certainly a binding contract, the "browsewrap" is seen by some as not as a clear cut binding contract. But, if your're properly guided by your tech lawyer, you should be able to post a valid and enforceable agreement on your site, if you want. Hope this helps.