Some problems with site

Hi all,

I am knee deep in my first web development project and I have a few questions.

First off here is my website: www.hamletfoil.co.cc
It isn't complete in terms of text, but most of the code is in place.
The first problem I'm getting is that when I visit my site in safari for windows, I get white rectangular boxes on various parts of the page. I asked a friend to visit the site on his desktop using mozilla 3 and he got different white boxes. What's going on here?

Secondly, I might be an idiot, but on the top of www.hamletfoil.co.cc/index-1.html is an "s" and a white box spanning the entire page. I cannot find this in my code. What happened?

Thirdly, the "contact the webmaster" on the bottom of www.hamletfoil.co.cc/index-3.html is messed up, however, it utilizes the same code as the other pages. Why is this happening?

Here are some screenshots with the boxes:




Please give me any advice/criticism/questions/comments that come to mind.

Thanks guys

EDIT: Fixed the "s" problem.

 

Thank you for this piece of info.