your links point here: /images/layout/backgroundwobjects1.jpg
your pictere is here: /images/Layout/Backgroundwobjects1.jpg
See the differences? You need to be consistent throughout. If you are using Dreamweaver, it ought to update everything for you when you make a change. I’m not sure as I’ve never used it. But make all of your changes then upload everything again fresh. That means, delete everything you have in there, assuming you have a static site and you are just starting out and don’t mind starting over.
if you are using Chrome or Firefox, hit F12 or install Firebug and you can see that a lot of your links give 404