Cross Browser Issue

[summitweb]

Hello:

I'm new to this forum and new to CSS.

I designed a web page using CSS which looks as it should within Internet Explorer.

When I try to view the web page within Firefox it looks wrong.

Please visit http://www.summitwebcrafters.com/index-test.html to see what is happening.

You will be able to see the difference between the two browsers immediately.

How do I go about fixing this cross browser problem? I have no idea where to begin.

Thank you for any assistance.