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Martin,
Sorry nobody got to you about this sooner.
From the screenshots you shared, it looks like the site is using a mildy modified version of the default theme. From what I can tell from the screenshots, it looks like the designer simply removed the table cell below the header and did a find and replace to change the colors in style.css. All in all, I'd say you could achieve the same results in a couple hours if you are familiar with basic XTHML and CSS.
Here's some resources that will help you get started:
Basic XTHML/CSS TutorialsXOOPS Themes FAQHTH.
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.