Your problem is not obvious from the graphics you posted.
Can you provide a link to a test page that demonstrates your problem?
It's obvious to me what the problem is. You used a graphics app to generate your HTML code for you. This is OK for quick prototypes only. As you're finding out, Photoshop HTML code is too rigid and fragile to use in a real web site.
Use Photoshop to create images only.
Use DW to build your web page.
Taking a Fireworks (or Photoshop) comp to a CSS based layout in DW
Adobe Developer's Center - Getting Started tutorials