OS: Windows XP
A lot of your images are not loading.
I didn't hear anything, but I noticed in your code you are using a sound file. Never ever play music with out user interaction.
Remove unused CSS code in your CSS file.
Don't put CSS in your HTML file, only in your CSS file.
Don't over use <br> elements, use CSS.
Don't over use <div> elements.
Indent your code with tabs. (or spaces, but pick one and do not alternate)
Also, a neat website to view your website in many operating systems and browsers is browsershots.org
It can take a little while for your request to finish if you select a lot
of different combinations.