Can you rate my offline webpages?

Here are my pages, I'm using 960.gs...

https://drive.google.com/folderview?id=0Byi0558NHlO-ZEh6emNPOW1URE0&usp=sharing

I'm not completely done yet as I'm unsure of some things...

I'm not sure of when to use a container for the elements that they contain, I thought maybe instead of using a container to use a class then style them all aligned with each other. It's hard to know when you actually need a new container and which container has certain properties.

On the websites I've seen they have many <div> elements just for things that look as if they can be done without that many elements.

And also, like sometimes it seems as if the html page has a previously saved css, like sometimes when I remove the properties of the css it stays the same, and sometimes the images within the slider container would be the wrong size, I set them to auto, I assume that they would be the same size as the container, the background is larger than the foreground when they are both set to auto.

And also with the menu bar I set the width to auto and it expanded to be wider than the screen, I set the width to 1349px because auto was too large. I'm unsure whether it would be a good option to set the width, height and position of the container then just have the containing elements positioned absolute. It's also hard to know when you should use absolute and when you should use relative, I know what determining which to use for each element is hard, like do you let it flow naturally then position it relative, or use absolute whenever you want, I try to use absolute where I can so that it moves with it's containing element.

And about the two images just after the slider, in the .psd file they are positioned so that they show a portion of the image, I tried using background-image and background-position for these but it wasn't working.

When trying to move the files from the .psd file, they aren't completely trimmed, I use the script in photoshop "export layers to files" so it goes through all the layers but leaves much white background on the image rather than trimming it, even when trying to trim the white on the slider background it leaves it there, is their a better way to do this?

Can people review my code? Is anything done wrong? Any suggestions?