No you can't make a site completely with Photoshop. You can use Imageready (haven't tried CS3 yet but it comes with all other versions of PS). In Imageready you can export your slices as a table layout or css/div layout. I strongly advise you not to do this (unless it's just for a
quick working mockup). The reason being that first of all the code that it outputs is an absolute mess. And if you don't know any HTML/CSS at all, you will not be able to fix errors. If you want to make proper websites on your own you'll have to bite the sour apple and learn XHTML/CSS. It's not rocket science though and there are plenty of tutorials (and forums
) that can help you get started.