Dreamweaver; visible in code view, invisible in Design view?

I have managed to get my slideshow working now, but something is causing me some confusion
I have my company logo at the top of the webpage in two tables overlapped over each other so when you resize the webpage it centres in the middle. The slideshow is visible in both views. However my logo is visible in code view, and when previewed in the browser, however I cannot see it in Design view in Dreamweaver. Why is this?

Could this be the answer?

Could this link be the answer I wonder? http://alexle.net/archives/119
I have gone throught it but don't understand this "- Go to l**ine 67**, add the THTML extesion to the **winfileextension** and **macfileextensionlist** attributes. Here is the code exerpt
"
What does he mean by this? Could anyone give me exact code to write?

That's a shame, I found the design view quite handy for the layout of the page.